Useless Vodacom Profiting

I phoned Vodacom in January 2021 to ask why are they still deducting my account for a contact I ended and payed off in March 2020. At first they didn't have any record of it and I didn't pay it off, but I have the mail that I sent through to *** in March 2020. The lady asked me to resend the proof of payment and I did. The contract was cancelled and the cancellation date was not back dated and Vodacom send me a bill of R2800 for the cancellation but I already payed almost R6000 in March to pay it off plus they have been deduction the money for the past 10/11 months for the contact as well. I have phoned 6 times and 3 referrals has been send to the BACK OFFICE and nobody has contact me yet to resolve this. Absolutely useless service and every time I call I have to explain to the call centre what is going on and on one of the calls 2 call centre operators argued on who's department problem it was. They need to train people beter or get rid of useless people that don't know what they are doing. Good luck on trying to debit my account if this is not fixed.