Telkom ruined my credit score due to negligence

I had three contract sims with Telkom and decided to cancel the two data sims. I was assisted by an agent called David and requested him to cancel the two 10gig data contracts in August. He promised to send an email for my requests. So my debit date os set to be on the 5th every month. As we started a new month which is September, I took note that my debit order did not run. I gave it a day or two and no sign of a debit order. I then went through my account to see if they tried to debit, but no trace of Telkom debiting. I went to the Telkom app tp see what was happening and to my surprise I owed plus minus R7000. I called in to find out why the amount due was so much, the agent then informed me that my 5gig router contract was canceled. He then said he will send an email to rectify my situation and informed me that they will contact me. I waited and waited until I called again to find that the incident was closed, I was given several incidents and all were closed with out keeping me informed of the progress. I even went as far as informing the agencts that this is messing up with my credit profile, especially after trying so hard to keep it clean. During October I thought they would debit, seeing that I now owed R580 something. To me all was in order. Not until I got an sms this week stating that my account has been handed over to NuDebt. Like the level of incompetence I have received with Telkom is so disgusting. My credit profile/rating has dropped because of Telkoms negligence. I was told the account will be reinstated amd they will continue debiting per normal,did that happen? Nope! I'm truly out of options n have been placed between a rock n a hard place. I'm truly disappointed and angry as I made my payments even the R580 payment. Someone needs to answer and held accountable for this nonsense. Last incident that was provided was ***1 and ***2. All other incidents were solved without my knowledge.