Dispute

Had account with Vodacom for years, account number I ********** and when my contract was approaching the end I knew I needed to pay R450 to Vodacom, went into the Menlyn store n I was told I owe vodacom around R850, at first I didn’t get an explanation and when I did they said I extended my contract by buying recurring data and what was surprising is that I never saw the data on my cellphone and now Vodacom is furnishing my name n got MBD law firm to torment me. I would like vodacom to let me pay for the service that I received then we part ways. I told MBD that yes they got handover but it is wrong. I owe Vodacom R450 not what they say I owe them, Can they please investigate n give me a proper invoice and give back the credit Bereau points that were ruined