Received a call today from this phone number: San Antonio, Texas area, but since it is an unknown number I let it go to voicemail but caller will not leave message... I assume it is either a telemarketer or a collection agency.

This is actually a company called JC Christensen and Associates and they are supposedly based in Minnesota and they called me for an unknown reason, I have no debt.   Anyway I had to call back about ten times until I got a manager and he finally told me they are a debt collection agency.

I got hung up on numerous times, just simply asking what business called me, and what is the nature of their business.  None of the employees ever informed me they were a debt collection agency until I got manager on the phone.