It is a federal crime to use auto dialers to contact cell phones.

Go to this online complaint site and file your complaint. http://esupport.fcc.gov/complaints.htm
The form attempts to nail down the offense by asking you if the line remained connected/engaged with the unwanted caller after you attempted to hang up. This is big no-no, and tells the feds a lot.

My NJ church once hired an outside contractor to develop a photo directory. The appointment reminders came from a phone tree setup in North Carolina. We were not able to complete the directory - not enough people participated to make it cost effective - but I have received these phone tree messages ever since. I received a call this morning as well.

I hate the abuse of telephone numbers. I pay the phone bill, it's for MY use. Respect that. Don't call me; let me call you if I am interested.