They are not asking for direct payment. They want me to pay the collection agency. I am not going to make an international payment to some random company that I have no idea about. I suspect they want me to do this because closing internally with the company will mean admitting to the agency that they sold a bad debt.

> I am not going to make an international payment to some random company that I have no idea about.

Why not? You do have an idea about them: TeamViewer asked you to pay them.

> I suspect they want me to do this because closing internally with the company will mean admitting to the agency that they sold a bad debt.

Maybe. Maybe that's just how it's easier for them.

What a stupid suggestion. If a company cannot be trusted to fix a simple billing issue, I sure as hell wouldn't trust their choice of random foreign company that for some reason they want me to send money to to fix their mistake.

This screams of dodginess and shoddy unfriendly customer service.

You're being rather unfriendly yourself.

Why not credit the new invoice, and mark the old one paid as the client asked?

Because they are incompetent.

On top of all the reasons already given, keep in mind the company is asking for additional late fees.

Sure, just don't pay those.