Excessive and system issues

I have had bills of approx *** then I migrated to a bigger package and my bills free to 1***. Suddenly this month they claim I have a data bill of over 3000 and total bill of over 5000.<br> So I went in to buy out my contract and cancel it. I was given a figure of 5130 which I went and paid after that I returned to the store. They called head office who claim that the system generated settlement is incorrect and that I should pay more that 20k. These guys are pathetic. I have been a loyal customer for over 15 years and this is the thanks I get. Seriously how can your system throw out different numbers all the time? I think I will be going to the consumer council with this case as I have a settlement print out and SMS from them which is now different according to some lady at head office. Seriously disappointing service. Hope everyone sees this before dealing with this company