If K receives money, then it won't unlock, so there's nothing to be afraid of. If it automatically marks as completed, then it must have proof of the transfer. If not, report it to Binance to confirm canceling the order and releasing USDT for you.

I really hope bincae will resolve this case - I sold the coin and the buyer immediately clicked that the payment had been made but I did not receive any money in my account. When I texted the buyer, there was no response. Please block this account to avoid being "Fire Islanded".