EDIT: 17th March after some discussions I got all the bitcoins we agreed on.
This guy is making business not based on two parties agreement but on his own mood.
We agreed on 24-Feb 2015, that I sell 2x Antminer S4 for 4.5 BTC (including shipping) to him.
He got my miners 03-Mar 2015
Then he started to stall sending btc to me (he promised, that he will send after miners are delivered and verified).
Finally on 6th March he asked
if he could pay less , as BTC value was higher now. I disagreed as we agreed to make the deal in BTC, we did not mention EUR nor USD anywhere while negotiating. I did not want to sell for fiat, btc only. So it is not my fault that exchange rate raised. Also if exchange rate would have gone lower I would not have backed my deal and claimed for more - no, we agreed the deal was 4.5 btc for 2 miners no conditions.
On 9th March he asked if I can provide invoice as he could not pay me otherwise...? The same day we agreed that exchange rate on the time of purchase was 209 EUR for one Bitcoin (he wrote me that and I agreed that exchange rate). So I made an invoice for him:
https://i.imgur.com/QamBnSB.pngOn 11th March I began to loose my patience, he said that in he's opionion I do not deserve more than 3.894 btc (that he did sent to me and I got it) which is approx 940.50€. Well.. I agree to disagree, we had a deal in BTC not in EUR as I described earlier. Also we agreed that exhange rate at the time we made a deal was 209 EUR / BTC. Not 241,525 what he used to send me those 3.894 BTC.
So I am missing 0,606 BTC from him.
All above can be proved and is documented.
BE WARNED when making deals with Protact or Daniel (Truman)