INCORRECT BILLING AND NEVER ENDING CONTRACT

In November I called trying to cancel the never ending contract with MTN, the consultant I spoke to convinced me to take another one which was much cheaper( R30), I took it only to find out that at the end of the month they would deduct the same amount that I was trying to cancel. I called them, they said they'll rectify that mistake. The following month they continued deducting the wrong amount, when I called them they told me there is another contract I had, taken in 2019- I told them that I DO NOT KNOW THAT NUMBER. This continued until MAY, I called again asking about the incorrect billing I am getting, the lady told me about the other number from 2019 and that contract was ending in May but I must send an affidavit saying that I have never used the number I have been billed for, which I did. I sent the email to the address I was given, after a few days I saw a notification saying the email is blocked. In July I called again, the consultant gave me the email address which she said is their manager's, I wrote the email to the manager but after a few days I saw the same notification. MTN continued deducting and I am reversing the debit orders which now keep on increasing. Today I called again but the consultant transferred me to the "CHAMPION "which never picked up my call, kept on listening to their music for more than 30 minutes.