it is sad to hear how people like to cheat others and swindle them off their sweats in the name of hustling. Living off people’s hard earned money by taking advantage of either their ignorance or their desperation to get the money. I am not an online police and would assume such a position but I will always keep a close eye and watch out for such cases in my own time so we can continue to sensitize each other on the ways and tricks these people use to manipulate innocent people from their own money.
Why would it be sad when it is quite common, it happens even here on this forum frequently a lot of the time. It happens everywhere that is why all of these things have reputation systems. If people understand how this world works and how to defend themselves against these things, the chance of being cheated is very low. Only some complicated cheating would work on you but if you are not a target then this won't happen to you. We live in a world where being a criminal or a bad person is not punished often enough or strictly enough so this is expected. If the consequences for cheating are low, many people will cheat. Only truly good people would not cheat if nobody is watching.
In a case like this don't release the coin quickly create a dispute. That way the Customer Service will have to look into the trade. As far as p2p is concerned no one will sanction you for creating a dispute as far as you were under paid. To avoid similar occurrence it's best not to negotiate payment at all because there is an automatic price set for each trade.
They are paid to do the job of resolving disputes and protecting both parties in these transactions, so it is very weird if someone thinks that they will get in trouble for this. The user should read more about how things work before using them, and I even previously wrote that there was no bullying involved at all. Just a bad situation and inexperience, which can be prevented from happening with all kinds of platforms with more knowledge.