Repeated calls regarding outstanding balances

I do not use the debit order facility and pay my account at the customer care center at the self service machine. <br> So in theory this machine should be requesting the correct amounts for payment and so every time a transaction happens via their system I should have confidence that my account should be up to date regardless if the payment was late or re-connection fees being charged.<br> <br> However in three months this has resulted in repeated and disrupting calls during work. Being threatened that if i do not pay this amount my service will be disconnected.<br> This would be very unprofessional since the problem seems to be caused by their own system.<br> I keep getting calls that my account is in arrears by about R300. My last payment at the machine included an extra amount I added to try and eliminate the problem.<br> <br> So being pretty fed up with this issue I asked for a supervisor, no surprise that there are no supervisors available. How are you supposed to solve this problem since no one would be happy to pay an extra R300 every month just because the machine doesn't give you the correct amounts to pay. Also I feel that the machine is giving me amounts that make sense and the call centres not.