blackberry contract, but cannot use fair usage dat

I have a blackberry contract, but since September/October LAST YEAR I cannot use my 1gig fair usage data. Numerous visits to branches, e-mails and calls to the help desc were of no use at all. It doesn't seem as if anyone at Cell C has any idea how to fix the problem - sometime during this time my contract amount was even increased, when I asked why, I was told that I now can load an extra e-mail address. WOW! Cell C, I do not want an extra e-mail address, I want to be able to use my fair usage data. Is that too much to ask? Just remove what ever you added and fix my problem!!! If you cannot fix the problem, I don't see any reason why I must pay for the contract - on your side this is contract breach. I've been complaining for FOUR MONTHS and no one is able to help me. You are willing to pay new customers R10000 in order to get out of their contracts with other service providers, maybe you must start rather start looking after your existing clients.