Disappointed in telkom

Took a contract with telkom in January 2019 via phone since they did not have that specific tablet in the shop. It was a Samsung galaxy tabE 9.6 5GB for R169. They debited that in the first month when they checking my account but there after they started debiting R319. I called but was then taken to the billing dept which could not help and told me to call the order dept which told me to call sales dept. All of them could not assit and one of the consultant told me to send them proof of of the special which i did and he told me he would escalate it. I called after a few weeks and was told my case was closed. I don't understand how, telkom never bothered to call in order to update me. I dont want to reverse the debit order as it will give me a bad name. In June they debited R150 and when i called to ask why they told me my account was ahead which i don't understand how. In July they took the R319 again.I'm so disappointed in telkom and don't think i will ever take a contract with them ever again. I took a contract that suited my affordability but now I'm paying more than what i had budgeted. The tablet they gave me did not even want to charge after the first time it became flat but i thought i might fix it and sort out this billing issue for now. As we speak i have not used the tab since January but for now i want telkom to fix this bilking issue.