UNACCEPTABLE SERVICE

So my account has been sent to DEBT COLLECTORS from over a year ago. As i am aware, i paid the account in full. Yet i have been told i have an outstanding amount of R1200. I had debit orders going off every month and i cannot physically stop them going off. So the fault is on VODACOMS side. I MADE SURE i always had enough funds in my account for the debit order, and if i some how didnt then i would of been penalized by the bank and then it would of gone off twice the next month. I am using the same account with the same bank to this day and i never received anything. All i have asked is for proof of when the last payment went off, when the account was opened, when i was attempted to be contacted, and how i was \contacted". Vodacom said i must get the PROOF from the Debt Collectors and Debt collectors say i must get it from Vodacom. NO one will send it to me. If i owe the money ill HAPPILY pay. I just want proof. However i dont agree with paying and extra R2300 cause no one contacted me and it is now a year later. UNACCEPTABLE. All i want is proof and evidence as requested. And speaking to Vodacom the 2 women (Mahadi&Phumzile) were unhelpful and disrespectful in Vodacom Legal Dept."""