Telkom billing me ridiculous amounts

Telkom has been billing me ridiculous amount for a R449 data contract that I signed. Last month they billed me R701 when I called and asked about the billing they told me I have subscription of which I don’t know about, I cancelled all of them but this month they billed me R804 when I asked about this ridiculous amount they told me about subscriptions again which I don’t know about. I then told the consultant to cancel my contract because I can’t be paying these ridiculous amounts on a R449 contract deal that I signed, she transferred me and I was waiting on the line for over 30 minutes and my calls was hung up