Frustrated customer

I am a Cell C costumer for years now, in September 2021 I unfortunately skipped a debit order a consultant called to arrange for my payment, I agreed to split the installment of September into two with October and November installment, it was done that way but in November I noticed I had two debit orders on the same day I left it, December installment I reversed has I paid twice in November, January I paid normal debit order but I noticed there was another debit order again, I reversed the 2nd one, February I experienced the same problem 2nd debit order March a bigger amount was been debited so I reversed and paid. the normal installment Vai Eft.,my frustration every day I get a phone call with complaints that I have arrears I paid every month the 2nd debit I do not understand I explained and send proof of payment with my bank statement still I get called every time a different person and I explained the same, their service is really terrible I am frustrated, yet they say they record every conversation for quality service I am confused if I explained so many times and send emails do they even take note what is the procedure some how there is no procedure in place, i am not in arrears.