PhoenixNZ: Telecom has a responsibility to either honor the contract or allow you to break it at no cost to yourself. If you have written documentation stating that you have 2GB allowance then thats what you need to receive.
If you dont get a result from the store then I suggest you follow their formal complaints process. It can get through to the TCF but most likley a complaints specialist will find some resolution for you.
Just remember the TDR is not a first call for complaints. Your have to raie the issue with the provider first, and if you're unhappy with the response you can then escalate it to the TDR.

