Poor Pathetic *********** service!!

I cancelled my order with Cell C because an additional sim was added that I did not order, 19/06/2023 I returned two sim and one device to them, I then called them on numerous occasions to ensure they received their goods and that my account with them was cancelled I was given Ref No *** & *** as confirmation of the cancellation. Cell C has debited my account on two occasions which have cost me money for returned debits they have also listed me on the credit bureau and handed me over to debt collectors that are calling me for money that I don't owe them I have also constantly called Cell C and emailed them and nobody can assist me instead they have told me to resolve the issue with the debt collectors & the debt collectors have told me visa versa. I want my name cleared and my so-called non-existent account closed with Cell C my name off the credit bureau and my file closed at the debt collectors Cell C must refer to waybill RW***4 all goods returned unopened to them