Over Charge on data.

Altech Autopage has been charging data even though the line has been suspended. The company has also charged data charges even though we have not used it, for example having a remaining balance of 200mb and i have unplugged the data card in order for it not be be active and at the end of the month i have still been charged out of data rates. Altech has notified us that this charge that we have received is because we only receive 2Gb day time and 3Gb midnight. Even though the balance inquiry has clearly shown 2GB + 2GB +3GB midnight data. We have been trying to get this resolved and have spoken to customer care agents and sent them screen shots of the balance inquiry, they are refusing to help rectify this. We are now being told that we must pay the full amount owing then Altech will be able to assist us with rectifying this issue. We have been fighting this for months and still have no answers.