Cancellation

I am beyond furious with Vodacom on two accounts I have contact them to cancel my contract and on both accounts they promised to get back to me but they did not. Also I just see myself doing business with them anymore as they have been sending me another clients billing statement which has that particular clients physical address as well as their cell phone contact details which is breaching the POPI Act. I didn’t think I can trust a company that is negligent in that way. And should they respond to this particular complaint can they not have a Lucius or is it Lucas to attend to my complaint again since he is very arrogant and rude.