Ackerman's Debt Call Centre

I have HAD it with Ackerman's and I am considering getting lawyers involved now, I have an additional, Pay as you go number that I have had for the last thirteen years, this is my own, personal number that only close friends and family have, however, the last four to five months, I am being harassed on this line, sometimes as late as 8 o clock at night, six, seven times a day (Ironically, as I am typing this, yet another call comes through) I have been friendly, I have been rude, I have asked nicely for this number to be removed from your system, as I have NEVER had an account with Ackerman's and do not owe you a sent. Ironically, when I answer my phone, In Afrikaans, clearly saying my name, these Idiots still ask for all these African names and Surnames. I'm sorry if somebody gave you a random number and are now not paying their accounts, but I do not see why I should be harassed daily, even begging them to remove my number and each time, being assured that they will, only to get another call a few minutes later. This is not on and I demand that this is rectified, I have blocked dozens of Ackerman's numbers, yet, the next day, they simply call from new numbers. I even wrote a scathing post on Facebook, however, nobody even bothers to answer me there either. Not Cool. :(