Incorrectly flagged for missed premium in credit bureau

My contract ended last month so I reverted to pre-paid only to find that vodacom flagged me for missing a premium worth ITC mind you. I find this very suspicious that when a client cancels their contract at the end of the 2 year term that vodacom doesn't have checks in place before doing something as serious as reporting a client who has never missed a premium EVER, for non payment. After numerous calls back and forth, not a single person I spoke to was able to assist by correcting this mistake. I'm told that they will escalate and a manager (who is never around when you need to speak to them) will call back and I can expect feedback with a paid up letter within 2 to 3 days. Assuming no one will bother to sort this out so I will be taking this further since your complaints department, billing department and customer service department cannot do anything about this matter.