Its a verification number for QWEST

obsessive/compulsive calls at 10:57, 10:58, 11:01 and 11:04 without leaving a message, and then when I call back it says the number is [scratch-scratch] invalid!??

Called for me while I was out, but refused to leave a message.  According to my son, the caller reported to be a friend of mine from church, but refused to identify themselves and was borderline rude and hung up.  When I called the number back, the caller identified themselves as "Wendy" but denied calling.

Very strange.

verification number for what?

CenturyLink I guess.  I think they were trying to call to let me know that Internet is back up, because I chose that option yesterday.  Called twice now when away from my phone.