Billing and acoounts

Telkom double debited my account for Mar amount of R539, I reversed the one amount of R539.Ten days later telkom reversed the successful debit back to my account and added a R200 charge for the reversal. In April I was double debited again for R389 and mad one reverse payment of the R389. I requested Telkom to rectify the R200 charge added so I can make a payment for the R539 they reversed they advised that i have to pay the R200 amount plus another R200 was added for the reversal I did for the April double debit. My subscription is R350 but now I am told I owe R2100 because telkom keeps adding R200 on my account every month. Have been trying to resolve this for 3 months with no luck instead I just keep on getting bad service and Telkom not wanting to acknowledge their mistake. They tried to assist at the store but the case was closed without being contacted.