***** debit orders for cancelled contract

My contract ended in February, I went to Telkom Northgate to cancel it, lady offered me an upgrade I told her I don’t want to upgrade I am canceling the contract, since is now on a month to month for 1GB data, it doesn’t include device. She advised me I will receive 24 sms notification to confirm cancellation, I didn’t receive the sms. End of March I notice they are still billing me, I phoned Telkom spoke to the call centre promised contract will cancel immediately. On the 30 April R302 debit order went off my account I reversed it instead of R100 for 1GB, my contract was R299 ( 199 was for device and R100 for Data 1GB day and 1GB night (I never received) since the device is paid up, I am supposed to pay R100 for 1GB, I paid R100 via EFT. I don’t know what is the extra to R202 for. I phoned Telkom on 25 May spoke to Koketso who promised the contract will be cancel and I receive the sms to confirm cancellation and they will refund me, I didn’t receive the sms. Call them again on 27 May spoke to Notsikelelo she advised she’ll escalate the matter to her supervisor they will cancel and credit R202 they are over charging and I will be refunded, I advised her they should not debit my account, I’ve stopped their debit order with my bank, I paid R100 for data loaded in May, to my surprise on 01 June R302 debit order was submitted to my account, I reverse it. I log disputed with chat Karabo on FB messenger I got confirmation my contract is canceled. They didn’t load 1GB data of which I was happy thought the matter is resolved. Today 30 June R404 was debited from my account for the contract I don’t have, these people are messing up my credit profile and the bank charges to reverse these debit orders, I want TELKOM to stop these ***** debit order to my account, I will never ever do business with them,