Gross negligence on Billing department

This is probably the 3rd contract billing dispute since I've considered Telkom for my contracts.I gave my month notice for my data contract so that I wouldn't have issues with billing but again the same issues have come up.Being billed for something I don't use anymore and then being handed over to a collection agency for me yet again thinking I'm not liable to pay my usual installment seeing as I should be on prepaid.So after a whole circus of me running around finding out on the telephone and going into branches why Is this happening and could the please resolve it.I eventually just decided to finally get this mess behind me I would pay the outstanding amount with the collection agency.Now out of the blue on the 04/01/2021 I receive a Telkom statement saying I owe R190. Unfortunately this has gone on for long enough and I'm at the point of no return.I would love for this matter to be resolved with immediate effect and a agent in charge of billing to read through all my cases and see that this is obviously a Telkom error and rectify the issue.Please contact Sebastian on ***