Contract cancellation nightmare

I extremely disappointed and actually disgusted with the way Telkom has handled my contract cancellation. My contract was due to end on the 15th of October 2017 and I was told that i would need to send through a cancellation form via email to ********** I did so in August. During an interaction with a call centre agent i was informed that my cancellation form was not received. As such in September i sent it through again and was told it had been received and would be processed. Even though my contract ended and i had requested cancellation earlier, telkom continued to charge me and send me invoice after invoice for services that i was no longer using. Complicating the matter further , i had left the country. i queried this further via email and was told to resend the cancellation form and it would be escalated to be processed. I had owed telkom R549 at the end of my contract but Telkom continued to add charges for subsequent months and debited over R710 from my account and attempted to debit R230 more but the debit order failed. I queried this and complained to Telkom and all they would say is that i need to send through my cancellation form and they will escalate it to be processed. This happened 4 times one after the other, meanwhile they continued try to debit R947 from my account even though my final bill had been settled. As my account had minimum funds, these debit orders would bounce and I would be charged close to R40 everytime. These repeated attempts to debit my account for an amount i dont owe have caused me significant financial loss. I couldnt go into a branch as i am overseas . I recently called again after another attempt was made debit my account for R947 and all i was told was to send my cancellation form and they will escalate it. this clearly shows severe incompetence and seriously suspect business practices . My requests to have these ridiculous debit orders stopped and the overcharged refunded continue to be denied even though my contract has ended and i have payed more than what i contractually owed. This is the worst customer service i have ever received and i would never recommend any to use Telkom, absolutely shocking treatment of customers