I already checked the history because i only occassionally get a payment and there are all other payments but no payment from this person. And the person only clicked in bitcoin.de that he has paid, he doesnt speak with me. Maybe he wanted to fraud so that i accidentally click that i received the money?
The bad thing is that the support isnt speaking with me too. So i have the bitcoins frozen and cant change it because no one contacts me.
You are missing the point. That is not your account history, that is the link that anyone can use to verify the details which confirm that a payment was sent. Thus the sender has the technical ability to prove that payment was sent.
So simply insist that the person provide the details showing the payment that ANYONE can use to verify that it was sent. Without that, there's nothing else for you to do, right?
So i have the bitcoins frozen and cant change it because no one contacts me.
Right now you aren't out any money, right? (Other than that your coins are reserved into the escrow for the transaction.)
If support has to arbitrate, then that Liberty Reserve transaction verification will force the sender to prove payment, and the money was never sent then that will of course not happen.
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https://www.libertyreserve.com/en/services/searchAnd you'll get access to those coins eventually.