Billed for a returned debit order

I'm very disappointed with Telkom ..I received my invoice with an amount of R500 after I was told that my contract pays R259 but how did we get to that amount?.. last month I had an issue with my bank and I closed my account at the bank ..I then went to Telkom store in thohoyandou with my new account and to have my account updated ..to my surprise the banking details were not updated..I noticed after some few days that Telkom didn't debit my account..called in the call center and I was told that you don't have my new banking details..updated the details and I was told that the new account will be debited as from this month...which I understood and I then made an eft payment coz I didn't want my account to fall in arrears...no body told me **** about reconntion fee ...only today I call the call center n I'm being told that I'm being penalized..this is day light *******..you have gone too far right now..I regret moving to this Network..it's the worst of them all..this is bad client service...how is it my fault that the store people didn't update my things on time? How was i supposed to know that?? I'm going to report this to the ombudsman and the consumer rights..you cannot abuse your clients and Rob them their money like this...I'm very ****ed..this needs to be fixed soon.