After opening new ticket and directly asking for Carol to take this ticket instead of any other support member, she answered me in matter of hours (instead of days as Bella usually does) and she was swift and easy to communicate with.
After exactly 2 emails we agreed on everything and the same mail has been sent to me as it has been sent to you:
Thanks for your consultation!
We have initiated the refund, please wait patiently, thanks.
Please let us know if you have additional questions or concerns.
Best regards,
Carol
BITMAIN
And before that she informed me about everything any person asking for refund should know:
Good day to you.
We will handle the refund with the following info, please kindly help to do the final confirm.
Please take note that it usually cost 1 month for the process and the USD will be transferred to BTC according to the real time exchange rate when our finance team doing the refund.
Order ID: 0012-------
Amount: 853USD
BTC wallet address: 12--------yLY----------pe---
Thank you for your understanding and cooperation.
Best regards,
Carol
Bitmain
So, in conclusion (TL;DR), with Bella, I wasted around 2 weeks of going back and forward and her last email was her trying to push me into making a new order and using credits EVEN AFTER I openly told her that I cannot pay with PayPal or USDwire and I am only making purchases with BTC. I stopped answering to that support ticket and gave bad feedback as mentioned above.
However, with Carol, it took me exactly 18 hours (of which I slept 8 hours) to come to agreement.