Disappointing service year after year!

My word Multichoice must be by far the worst customer service provider I've ever experienced in the days of my life!!!!! I've been their customer for years, service zero, in fact none existant, something as easy as changing a contact detail on the system, my mistake was to give them more business by upgrading my package, all along they had my correct contact number but now they keep calling my mother who's ill every week for silly staff, I've asked them on 3 occasions to please stop using my mother's number asking for me that's not my contact number!!!!!! My mother is elderly and sick stop calling her!!! You've got my number use my number for the correct customer you want to speak, simple.