Paranoid?

I recieved a message on my office phone today,

"Hi, this is Amy from Eastern Collections, can the person in charge of account recievable please return my call at 1800..."

Oh shit! What do I owe? I don't owe any money, I've been really good for a long time now.

I did promptly return the call. They wanted to know if I needed their services. If they only knew!