Proton claimed there was no way to appeal, but Swiss law is not bound by Interpol. I think what it really amounts to is they are not going to protect their users. This is why you don't pay for let alone use a corporation's services unless you willing to give up your privacy.
Proton is not your friend, they have and will continue to betray their users. Do not trust them or any corporation that is not willing to fight for their users.