They've been calling me twice a day for weeks, using several similar numbers. There's never anyone on the other end when I answer. I've called them more than once, they've said I was taken off of their call list but they keep calling me.

They call themselves "MRS Associates", which seems to be a semi-legitimate debt collection agency, but that company is based in New Jersey and the area code on this number is for the Dayton area. From the fact that it is absolutely impossible that I owe them money, they've never mentioned being a collection agency, and that when you call them back they just try to collect your information as quickly as possible, it's pretty apparent that this is a fraud operation. Don't give them your information, block and report.