Yeah, same here, I got one or two collections calls on my OnStar number from people asking for whoever had the number before me.
I'm guessing OnStar phone numbers end up coming from the same pool as Verizon Wireless prepaid phone numbers. So, you could either inherit the number of someone who had a prepaid phone because they rarely ever used their cellphone,
or you could end up with the former phone number of someone who was on prepaid for
other reasons (like bad credit).
OP: it looks like 703-291-9021 belongs to Merits Research, which GM probably hired to survey new car owners. Chevy Volt owners are getting similar calls. You can get on their do not call list by calling 1-800-864-8601.
http://800notes.com/Phone.aspx/1-703-291-9021
Judging from all the complaints about hangups and blank voicemails, they do a pretty lousy job.