Serious Billing Issues

Telkom SA, a bunch of **********. I had a contract with telkom on their data mobile. A 10 G data package for R140.00 per month the first three months that's the amount I paid, after a consultant advised that I should have a 1 grand limit. That will ensure that there is no access amount charged in case my data finished. I experienced different Bill's there after, I made a call to enquire why I had been billed more than the usual amount, I was told that my data had finished and therefore this was a charge outside the package. I made numerous calls to rectify this with no success. I ended leaving it as is and asked for an extra 500mb should my data finished during the month. In March 2020, my contract was due to expire. I called the call center to cancel my contract, I was then redirected to the online processes for cancellation. Which I followed. In April I paid the outstanding amounts, and waited for my contract to be canceled 30 days later, that did not happen. A statement came with the device billed, and data usage for the next three months after that. My contract had experienced in March and therefore the device is no longer part of the billing since it's been paid up by the contract term. Since then I have been billed an exorbitant amount. More than what I paid when I was on contract. Another agonizing process to cancel the contract. The sad thing I'm still being billed, exorbitant monies, and tied to something I really don't want nor need.