I used to have this problem all the time,( one HUGE down side of having excellent credit!!! )
and trust me,
if it was a female on the other end of the phone, I would say some very nasty things to her that could probably have me locked up in jail!!!
I called my phone company (Verizon) and they changed my plan that stops them, and I NEVER get them now !!! but I pay for it!!! $$$