That does happen to everyone. It's the latest trend in telemarketing technology. (well, not THE latest, but just lately broadly deployed)
They have a machine set up to do a dry run through their number list. It'll record whether the result of the call was diconnect, busy, no answer or answer and the day and date and determine from that data when would be the best time to call and get a live person.
Isn't technology wonderful? I mean, we no longer have to actually talk to some trustee from a state or federal prison to tell them it's none of your damned business when I expect to be home next.
India Indicas, Mr. Peabody?
-- Sherman