Harassment over unknown *********

I am sick of being harassed by this firm of attorneys over the unpaid account of someone with the surname Xhoza who has not paid his/her account. Every day I am called by this firm using different numbers which Identicall tells me is MBD. The first time i said I do not know this person they are looking for, which is the truth. Since then they hang up as soon as I speak as I suppose it is obvious from my voice/ accent that I am not someone likely to have the surname Xhosa. Yet despite this having now happened TWICE they keep on calling! Where are their ****** brains? Why does this firm of so-called attorneys employ such half- wits that they persist in this *****ic behaviour? This is starting to become harassment and I am sick of it. Why should I be subjected to this because some ********* picked my phone number at random to give as a contact number? They must either have the guts to speak when they hear my obviously-white voice, or they must call in tracing agents to find Mr/Ms Xhosa,but LEAVE ME ALONE!!!