PAYPAL – Instagram account transaction issue

Hi everyone,
I've sold an Instagram account in February on PayPal for 5 figures, on august I received an email from PayPal telling me that the money will be put on hold then transfer back to the buyer because his Credit card was stolen , I'm pretty sure it wasn't, the buyer is trying to get the money back because if you call your bank and said that, all of the transactions will be cancelled.
I've already sent proof to Paypal, their response was " we going to open a case with the bank", they…

PAYPAL – Instagram account transaction issue