Shocking Service

I am constantly billed incorrectly on my Telkom bill for the Fibre contract that I have, almost every month I have to contact them and then they have to refund me and advise that the issue will be fixed. I have now had enough of them so I called to cancel my contract, I spoke to a lady by the name of Meryl and she advised me that Telkom upgraded my line and have extended my contract, this is not something that I requested so I was advised to contact the sales department. I call Sales and I spoke to Zamandulo Ndlovu and she says that the line is not up graded and that my contract ends on the 18/9/2021. She is not sure were Meryl picked up the upgrade. They work of the same system but I get different information. Shocking Service. I need someone to contact me to cancel the contract and advise me of the costs and the process