PPCGeeks - htc touch modem hack?

I would consider myself a PPC noob, and I used my htc touch as a modem for about a week on my laptop at work. I checked with telus (my provider here in canada) and I guess I slipped through the cracks, because after using 690mb of data, I didnt get charged a penny. The rep on the phone said I would have been charged $7200!!!!!!!!!!!!!!!!!!! ROFL. needless to say I got lucky, and now Im reluctant to keep using it.

however, I was wondering what my options are in order to use it for free. Im sure there is a way lol

Im using htc touch with windows mobile 6.1
rom version:3.07.661.1
with telus mobility.

any information would be appreciated