Vodacom overcharges

Vodacom has overcharged me by R100.88 for the last 15 months as a discount on a new contract was never uploaded, soon to be 16 months! It has taken 6 weeks for an investigation to done by the billing department and still no feedback. The person I dealt with has only made the effort to contact me on the day I made the query, 6 weeks later, numerous calls with not luck and a few emails to follow up on progress and no response as the person i dealt with has been on leave. It must be nice to have a 6 week vacation.

I have email proof from of what the charges should be and however still being overcharged and well as the intial confirmed quotation for the contract.

Perhaps stopping the debit order will get some attention to sort this matter out urgently.