Telkom is pathetic and annoying

I have renewed my second contract with telkom in August 2020 for R255, of which it was deducted correctly at the end of September 2020. But bill for October raised from R255 to R1755 of which is the take home money on monthly basis, I lodged a cancellation but the finance representative explained to me that the plan was open plan, of which I understood. Then he said it was changed to Top up one and that I will continue to pay R255,00 of my monthly subscription. Then invoice for November popped up with the amount of was R2089.26. On it is written device obligation/ carry over amounting to R1892. Again I lodged a dispute of which no one has ever returned a call, when you call their customer service number is taking me to WhatsApp that is not useful. I wonder why when Telkom or their Agent Mondo talk to us when they need vulnerable ones to fall into traps of their poor contracts, but when we are in dire need of their assistant they refer us to machines. I regret the day I upgraded my line as they have stole my childrens benefits.