Does anyone know how to get a trademarked brand removed from the wrong store?

So this is a super weird one and hoping the hive can help….

We own a brand (fully trademarked, established for years) and one of our retailers a few years ago started selling on Amazon against our T&C’s

Unfortunately it turns out this retailer hired an agency who did it, and that agency no longer exists and the retailer is technically inept.

So now there’s a store called “mybrand store” on Amazon and we’ve been trying to get it removed but we’ve only been able to contact ai bots that are useless.

We’ve tried the usual published guidelines and got nowhere.

Anyone have a human contact or department at Amazon to trouble shoot this?