Telkom Unauthorised Debits and blocking of account

Telkom debited me 5 times during the month of October. Granted my payment was returned for insuffecient funds on the 1st of October. I asked who authorised these additonal debits by NuDebit in October and was told Telkom had. I then asked for a copy of my contract but was told by the online agent that they could not assist as sales would need to provide that and would have to go to the store i signed up with over 4 years ago. I doubt that they would have a copy so asked who else could assist me and was told I would need to email ********** for assistance. 2 of the debits as well as a manual cash payment have been processed yet my account is still blocked!!!!!!!!!