Telkom unauthorized debit

For months I've been battling back and forth with telkom about an unauthorized debit from their end for data bundles. I told them that I never agreed to a contract for data bundles instead I wanted voice bundles and clearly the consultant did not care, they just wanted to make a sale. TELKOM insists on debiting my account on basis that even though I did not agree to data bundles, those bundles were already allocated by the time I called in to dispute, therefore they debited my account regardless of whether the bundles were used or not. I'm not going to pay for something I did not authorize for or even use. The mistake was on their end and they are failing to investigate. Every time I call their call center, I get promised that the matter will be escalated but no one has contacted me so far and come month end, they debit my account. I wrote emails and spoke to numerous consultants with many promises that the matter will be escalated and looked into. Every I reverse a debit it costs me money and I am tired honestly. Telkom must stop debiting my account, they don't have authority. I am tired of the harrara*****t.