Medical Financial Solutions. They will call you if you have an unpaid account from a hospital/doctor visit. They are usually foreign or african american and very rude/unprofessional.
I got a call from someone with food in their mouth and it took her forever to spit out her message. It sounded like she was trying to savor a hard candy in her mouth and the fact that she needed to leave me a msg kept interrupting her from enjoying her food. I was disgusted and left a msg stating the next time they need to contact me and I am not home to answer, they need to tell me what it is in reference to, and that it would be appreciated if the person leaving me the msg finished eating before calling me.