Who called from 2016544564

I have been receiving calls every half hour some times, these people are crazy! My phone number is on the DO NOT CALL list now. But even so, how did they get my number? I pressed 2 to get off their list last night, but they are still calling me (8/11/09)

i have been getting calls from this number ever 20 minutes. i'm starting to get real annoyed.

I need to know who is the caller.

The have called me 2 mornings in a row at 7:30am, one was a Sunday.