That's obvious thing but If you were scammed, what will happen is that even if you did press release button only after receiving the funds, you will get chargeback and 0 funds for selling your coins. If something like this happens to you, do remember to give that buyer negative feedback so others don't get scammed as you did.
Seeing again how much the transaction is made, don't forget to look at the feedback first, if the feedback is 0 or even negative,
then don't do the transaction to be safer.
If it has already happened and you haven't received payment, do negative feedback to report to the Exchange platform,
they will definitely respond and will do what they can do.
They also have complete data and can detect who the scammer is.