So dissapointed with telkom

In April last year I went on maternity leave then informed Telkom that i will be on unpaid leave for 4 months but will try to make payments. Unfortunately couldn't afford to pay the full amount for that 4month period. In October 2014 I then called Telkom to find out how much do i owe them coz i wanted to clear the arrears on my account and i was hoping that i would continue with the contracts. i was then given a balance and get told that the contracts have been cancelled and given the total due to clear all the balance in my account. In December 2014 i made the final payment and requested Telkom to send me the settlement letter this was sent to me on the 2 January 2015 by Zanele Bukali. To my surprise on the 28 February Telkom debited my account with R3693.33 i asked them to investigate for me where is the Bal coming from since i was told that the account is paid up. Can some please sort out my account as I'm not gonna pay for their incompetence coz if i was told about that Bal this would have been settled long time ago. i need some with authority to address my query immediately. Your aurgent response in this matter will be highly appreciated.