I also tried to call the number back directly and pressed 1 to get them to take me off their calling list, well that did not work either. They have been calling me about 1-3 times a day for the last 3 months and it's getting old.
This number rang me yesterday evening three times in one hour. I don't know anyone from the 615 area-code, so I didn't answer it. I let it go to my voice-mail, but no messages were left. I know to not answer and check the number with this site, as they are most often a scammer or something. I was right.
Much the same results as the other people who have commented here. Can the ant/spam hints noted here work with ATT (without texting capability?) Thank you.