debt amount

On the 30/06/2015 cellc debt my bank account with R542.58 which isn't the amount that I normally pay. When I called in to the call centre to find out why the total came to that amount the agent advised me that a R50 have been added to my account for the sim swop that took place and also R70 for bank charges, I the requested to speak to a manger about the R70 that's for bank charges. I then spoke to the manager Tambo and he told me that I would have seen on my monthly statement that bank charges have been added but statement I never recieve for this year, for the last past 3 months they send me an sms saying what the amount I need to pay and then I would pay my account. The manager then told me that the R70 was for last months bank charges but last month they send me an sms saying that I need to pay R401 which I paid in full and nothing that a R70 will be added. I then asked the manager to reverse that R70 so he told me that he can't but in March or April a customer service agent removed the bank charges without me asking them to do it and now a manager advised me that his not authorised to do that. He then told me that he can escalate my matter then afterward he said he cant do it.