MultiChoice keep on calling after I request they stop calling me I am not a client and never had an account

MultiChoice people ceep on calling me regarding a decoder. I never had a decoder and do not understand where they got my number. I requested that they remove my information and stop calling me but the keep on calling me. Please Dstv you are to expensive to use and I never will became a client. Please leave me alone and stop calling me. You do not have persition to call me on my private phone this is strickly for friends and family not advertising