I'm not sure if the warranty is still valid once you've purchased outside bitmain but it's worth a shot, so better ask their support about this or better yet, you could also ask cryptofinancial if they could help you out since they're the ones who bought it from there. Check the warranty status here: https://service.bitmain.com/support/warranty
I honestly think they should help you out as it's a part of providing good service but seeing that they made you pay for customs two times and refunded by giving you discount coupon, makes me think they only care about themselves. I have a feeling they would refuse but still give it a go op!
oh and thought you may wanna know so here's a recent complaint about the site in the forum: Cryptofinancial life SL / mineroo.io
Topic: Purchase experience at CRYPTOFINANCIAL LIFE SL (Read 147 times)
I don't know if this is the site where you purchase your device https://crypto-financial.io/ because you forgot to mention it, they have a very bad after sales support and this is not good for you and for their potential customers if they have an official thread here then you can post your complaint there, anyway with this post, people will find out how bad their after sales support is.
Excuse my English, it's a translator. 
Some time ago I asked if anyone had bought any device in this company Crypto Financial Life Sl.
Finally I decided.
I will tell you about the experience I have had with them in my purchase of an S9 Hydro device.
In the first place in the sale announcement it is stated that the device takes about 10 working days to be sent.
Also in the price is all inclusive shipping, customs, etc.etc.
I found that three weeks after the payment I had not received the device yet.
I call the company and they tell me they have problems with customs but that it will not be long.
Spend another week, call again and the same, AND another, and another week more
Finally, about two months after the payment, the device arrives, but ...
The transport company, I think it was DHL, requires me to pay the customs.
Fed up with so much waiting, I got the customs and immediately called CryptoFinancial.
Yes, yes, it was an error. We will discount it in the next order.
Go, as if he were forced to ask for another device.
The same, tired of waiting, I tell them it's worth, we'll talk about that payment.
I connect the device and ... tachin, a card fails.
I'm calling to know what I'm doing, if I sent them the device and how. Since they owe me some money from customs I think they will take care of the return shipment.
There already begin to give me long in several calls that I make them. That if the manager is gathered, that if the girl who knows is talking on the phone, that if I consult it, that if we are looking if we change or repair or send you another. I'll call you when I have the solution, always says the girl.
And three more weeks pass without a phone call or any contact. Until by chance I call myself again (after five or six times) and put on the phone someone who does have some idea, but says he did not know anything about it. I did not know anything???
Ahh ... you have to contact Bitmain, we do not take care of the guarantee.
As no, I have bought the aprato to you and not to bitmain ??
Oh, we are not the factory.
And the shipment to china, since you owe me money?
That money is for another order.
But if I'm not going to buy anything else! then what do we do?
Ahh ... it's your problem if you do not buy anything else.
In short, as you see responsibility, service and customer service of this company, CryptoFinancial Life SL, zero below zero.
Apart from that, something he did not remember. The invoice sent to me is 90 $ when the purchase was 570 €, to save customs. Which I'm also going to report. I think hacienda can give you a little work for this.
Now I have a broken device, I've been lying down for a long time and a lot of money, and the problems of making a claim for everything that happened.
Each one of you get your own conclusions.
Thanks for reading me.
Some time ago I asked if anyone had bought any device in this company Crypto Financial Life Sl.
Finally I decided.
I will tell you about the experience I have had with them in my purchase of an S9 Hydro device.
In the first place in the sale announcement it is stated that the device takes about 10 working days to be sent.
Also in the price is all inclusive shipping, customs, etc.etc.
I found that three weeks after the payment I had not received the device yet.
I call the company and they tell me they have problems with customs but that it will not be long.
Spend another week, call again and the same, AND another, and another week more
Finally, about two months after the payment, the device arrives, but ...
The transport company, I think it was DHL, requires me to pay the customs.
Fed up with so much waiting, I got the customs and immediately called CryptoFinancial.
Yes, yes, it was an error. We will discount it in the next order.
Go, as if he were forced to ask for another device.
The same, tired of waiting, I tell them it's worth, we'll talk about that payment.
I connect the device and ... tachin, a card fails.
I'm calling to know what I'm doing, if I sent them the device and how. Since they owe me some money from customs I think they will take care of the return shipment.
There already begin to give me long in several calls that I make them. That if the manager is gathered, that if the girl who knows is talking on the phone, that if I consult it, that if we are looking if we change or repair or send you another. I'll call you when I have the solution, always says the girl.
And three more weeks pass without a phone call or any contact. Until by chance I call myself again (after five or six times) and put on the phone someone who does have some idea, but says he did not know anything about it. I did not know anything???
Ahh ... you have to contact Bitmain, we do not take care of the guarantee.
As no, I have bought the aprato to you and not to bitmain ??
Oh, we are not the factory.
And the shipment to china, since you owe me money?
That money is for another order.
But if I'm not going to buy anything else! then what do we do?
Ahh ... it's your problem if you do not buy anything else.
In short, as you see responsibility, service and customer service of this company, CryptoFinancial Life SL, zero below zero.
Apart from that, something he did not remember. The invoice sent to me is 90 $ when the purchase was 570 €, to save customs. Which I'm also going to report. I think hacienda can give you a little work for this.
Now I have a broken device, I've been lying down for a long time and a lot of money, and the problems of making a claim for everything that happened.
Each one of you get your own conclusions.
Thanks for reading me.
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