still being billed

i have queried this over a month ago on hello peter we got responses but that is where it ended nothing was done i have names and references as well, a manager needs to call me and this needs to be sorted out today or i will have to get lawyers involved i am a loyal customer for years and this is the treatment i get. i am being billed for a phone i gave back and i cancelled in august already how is it possible for my contract to get cancelled and me refunded this is ridiculous vodacom is beyond pathetic ...6th october spoke to randall cairncross vodacom social media team ref 1- ********** ********** promised to take 7-14 working day to resolve to date havent received a courtesy call to say what is happening not a single agent can sort this problem out than spoke to the call centre agent muneb kolia from e service saying they are investigating the matter so does this take two months to resolve i dont think so. while all this is happening vodacom is busy debiting my account which is ***** as it does not belong to them, i need someone that knows what they doing to contact me urgently.