Got sick of them never leaving a message or answering when I call. So I answered the next time they called me. It is a VERY annoying marketing survey for "prior services used." They are hard to get off the phone, I recommend do not answer or just hang up after the first annoying question has been answered.
Didn't answer, left no message. On the caller ID, instead of a name, it shows the following two numbers separated by a colon: "7766279:8012149". Maybe somebody can figure out what that is.