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please help me... what should i do??? ):
Ahoj.
Ask management to cancel the negative rating, it is absolutely clear and obvious who and what happened.
Don't give up, It is sad right from the start to have a bad experience. Just don't send him coins again-
repeatedly.
This is an example from an account,,paveldedeman's profile,,

Rojomano's profile -repeatedly sending coins and it's sad.
I don't know if it's the same person and the same IP address:
https://en.numista.com/echanges/profil.php?id=79028
https://en.numista.com/echanges/profil.php?id=147808
it would seem very sophisticated and experienced, There were no mistakes in the composition of the coins on offer,
I think it would be time to rethink the form of being a member as of now -
IP address and screen document identity card, driver's license only when you want to change and trade. I think GDPR makes it possible while maintaining the principles of information.
As prevention from crime.
And please don't confuse the people of Romania for being thieves- this person will move to New Zealand and will continue there in villains and disgrace people living there.
It is always necessary to consider and minimize the possibility of disappointment,, Have you selected to exchange a member with few ratings? error,,
Don't give up!!
Ivan