Taken for a ride with data bundles

The past couple of weeks I've been seeing my data bundles fly off in the most amazing way. <br> <br> I called in to lodge a complaint 2-3 weeks back, after I bought bundles and they where never loaded into my account, was told it would be rectified within 48 hours, it was never sorted and no one bothered to call me back. <br> <br> 2 days back I bought the 2 gig bundles in the morning, left the house, there was no one, by the time I returned in the afternoon, I didn't have bundles. <br> <br> This morning, I bought another 2 gig at 7:15, all I did was download at 100 mb video from Dropbox, responded to emails and went on iTunes, by 8 less than an hour later I didn't have bundles anymore. <br> <br> This is really taking clients for a ride. Not happy at all, paid over 4g for this modem and it's the most expensive internet connection I've ever had. Fast but way too expensive. Very dissapointed