To prove your story, can you sign a message from 1Gu7wp61XSZsR63a82yu86hizRxfZuP3WK which is the address that you sent the BTC from?
edit: corrected address requesting a signature from
Sent from Coinbase, tell me how and I'll gladly do it.
I can also show you photos of the summary, PRIMEDICE login, ect.
Post a screenshot of your coinbase account sending that transaction then.