How to unlink my account from the Owner?

[MBConsulting]

A few years ago, a client added me to their professional Zoom account and my basic account still seems to be linked to theirs. The client ceased to exist and also claims the zoom account is no longer existing and that they don't have further access to it. However in my account they are still the "owner" and for example I cannot share whiteboards to anyone else. Anyone got a solution on how to unlink if I am not the owner?