Well done TC!
They also said:
Additional usage packs
You told us you were tired of being topped up by full size usage packs, often right before the end of the month. So we've taken this on board when designing our new additional usage pack options. Instead of giving you another full-size pack when you go over your usage, we'll simply top you up 1G at a time, at $2 per pack.
Again, well done TC!