ACCOUNT SHOWS R0.00 PAYABLE NOW ACCOUNT IS SUSPEND

I received an account for October 2015 indicating that there is no amount payable. As previously I did not make a payment as it shows R0.00 owing. At the end of the month they tried to deduct the amount of R259.00 which was not available as the statement indicated the contrary. I emailed them asking them to look into the debit order. I have not received any feedback regarding my email. Someone phoned me in last week (6 November 2015) and I explained to them that he statement indicated that nothing was payable and he informed me that that is impossible and that I should pay even when it showed nothing payable. I informed him that he should take a look at that because how can you make a payment on something which shows that there in no payment outstanding. He requested me to send an email with he statement and that he will take a look at the account. I still have not received any feedback and now the account is suspended. I am not impressed as my account is up to date and showed that no amount was payable.