Here's the deal.

My mom died about 6 months ago.

My brother just started receiving nasty phone calls from a company called Allied Interstate. They ask for my mother.

They don't say why they're calling, they don't leave a call back number or name. He hasn't received anything in writing. They threaten to call daily. My brother is also ill.

A little internet research tells me that this is some notoriously evil collection agency.

We don't think my Mom had any outstanding debt other than the usual bills.... or just aren't aware of it.

How should I proceed, other than telling my brother to demand to speak to a supervisor of the company?