BLOCK THEM!!! If they are calling your cell (as they do mine) Block them... I have Verizon and I can block unwanted calls. If you're not sure, call your celll company, and they will tell you how to do this. On my home phone, (maker: Panasonic) there is a feature that lets me block 10 numbers. I hope this helps.
Received call from this number. Left no voice mail. Called number back and put into a "Q" hold on for 5 mins. then hung up. Hopefully its the end of them!