Question about NV2 - 611133

Hello, I would like to return this SSD drive. How could I do that? My problem is this: I bought it, installed it, everything is fine. After the first restart of the computer it disappears. I have tried to find information. I read everything again, no matter where I was on the pages. I sent it to a computer service, but nothing. I have come to the conclusion that this SSD card does not fit my motherboard. I want to return it, but I don't know how. (Translated with Google Translate, I live in Switzerland but come from Ukraine)