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

Hi everybody,

I did a Binance P2P trade for about CHF 10,000. Earlier than releasing crypto, I adopted normal steps:
Verified the customer’s identify matched the Binance account
Requested if the checking account was in his identify → he confirmed yes
Cost came from that very same identify/account from his bank (Valiant) to mine (PostFinance).
No third-party directions or off-platform payments.
Released crypto solely after receiving the bank transfer and confirmed identify match.

10 days later the equivalent amount was frozen in my account and I immediately raised a Binance P2P attraction.
In the course of the attraction process, 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. Level necessary, 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 someone else initiated actions and he didn’t authorize the transfer
Binance has stored the dispute open
My financial institution has now frozen the CHF 10,000 incoming switch for compliance assessment.

Now I’m curious : might someone hack someone else’s Binance account in addition to their bank account, provoke a P2P order, withdraw the launched crypto?

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