What happened::
I was selling 2 Bitmain coupons, we agreed to trade them one by one, got payment for the first one, never got payment for the second coupon, although he's been online since, seen my messages.

Scammers Profile Link:
https://bitcointalk.org/index.php?action=profile;u=2000486

Reference Link: https://bitcointalk.org/index.php?topic=4591121.msg41426455#msg41426455
Amount Scammed: 80 USD
Payment Method: BTC
Proof of Payment: didn't get payment
PM/Chat Logs: https://imgur.com/a/vToFnzL
Additional Notes:

There is a slim chance he's just unavailable, in this case I will delete the post, but most likely scammer, after our transaction (my fault, should have looked sooner) I found a link in this thread: https://bitcointalk.org/index.php?topic=4610679.0 that suggest Tagtuyot was selling his account, probably sold to a scammer.

How do I leave a negative feedback on his profile? Or I can't, because I'm only a Jr.Member?