Lack of communication ends up in taking more money

On 8 May I got a e-mail with account statement, displaying that my account is paid up to date. On 10 May I got a e-mail stating that I am handed over for debt collection. I phoned the call centre and they said that my account is outstanding for 90 days, but the latest statement said I am paid up to date. I called on 14 May 2015 and asked for a settlement statement (as well) and the arrears to be able to terminate the contract. On 14 May 2015 I paid over an amount of R2708.01 and faxed the proof of payment on 15 May 2015 at 08:48 with a signed document to state that I am terminating the services. I phoned on 16 May 2015 to ask if the payment was received, they confirmed and put me through to the cancellations department to change my number to prepaid. On 28 May 2015 I received a sms from my bank stating that ALTECH AUTOPAGE TOOK ANOTHER DEBIT ORDER OFF MY ACCOUNT OF R608.01. For what reason? Now I have to pay the R3.20 bank charges aswell. I phoned the call centre again on 28 May 2015 and they told me to call the next day.I phoned again on 29th and had a very rude person trying to help me. I now had been on the phone for more than 30minutes, that I pay for and it still not sorted.