Hi there Jerzy1.
Welcome to the Community!
I'm sorry to hear what has happened here. If you have sold an item through PayPal and a case was filed, you would be required to respond to the case through your Resolution Centre.
We would advise you to provide as much information through your account and you would receive an update on the case via email when there is any new information.
You should also review our Seller Protection Policy to see how you may be covered for this transaction here.
I hope this helps.
David.
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