Bank froze my CHF 10,000 from Binance P2P, buyer now claims account was hacked. What happens next in Switzerland?

Hello everyone,

I did a Binance P2P trade for about CHF 10,000. Before releasing crypto, I followed regular steps:
Verified the customer’s identify matched the Binance account
Asked if the checking account was in his identify → he confirmed sure
Cost got here from that same identify/account from his financial institution (Valiant) to mine (PostFinance).
No third-party directions or off-platform funds.
Released crypto solely after receiving the financial institution transfer and confirmed identify match.

10 days later the equal amount was frozen in my account and I immediately raised a Binance P2P attraction.
Through the attraction course of, he wrote the next assertion :

"Bonjour, Mon compte a été utilisé par une tierce personne depuis longtemps, qui a pris accès à mon compte. Je m'en suis rendu compte uniquement grâce cette transaction depuis mon compte Valiant pour ce transfert. Je n'ai pas donné l'ordre de transfert, je me suis fait arnaquer et une plainte a été déposée aujourd'hui. Je n'ai jamais eu accès
aux cryptomonnaies de ce deal. Point essential, ce n'est pas moi qui ai initialisé le litige de cette transaction, mais le hacker!"

Which means that : The customer claims his bank/Binance account was hacked
He says another person initiated actions and he didn’t authorize the switch
Binance has stored the dispute open
My bank has now frozen the CHF 10,000 incoming transfer for compliance evaluation.

Now I’m curious : might someone hack someone else’s Binance account as well as their bank account, initiate a P2P order, withdraw the launched crypto?

What happens in this type of state of affairs in Switzerland?