Dissatisfied angry customer

I have been having data issues with telkom throughout the lock down period where my data wasn't lasting me as far as the 7th of the month. I called in all 3 moths and was told that I had used it but they were not able to tell me who or when. Which I find strange, however I let it slide. Last month I got billed 3x my normal installment I have a capped data deal which I pay a set fee for. After calling them on for different occasions I was told that I had purchased the extra data in August and I need to pay for it coz I used it. Please bear in mind I was not aware of such a service as I knew it is a capped data plan so once it's finished we switch to our cell phones. So I asked how did I purchase this data they say they can't tell me exactly... I asked for the dates and they gave me 2 dates of which we were not even in Durban..? So I would like to know if someone is hacking my account internally? You I was upset being ****** during lock down for my data. But telkom physically got into my bank account and stole money from me.... Now that's where I draw the line. I really want to cancel my contract that's how angry I am the fear that next month I could be billed for R5000 and what then? I can't complain or get my money back coz no one has answers!!! Telkom I want my money back!!!!