I agree with wetb... they upped my bill when I go the marquee too. I just called them, and they fixed it... So, when my next bill came and it didn't reflect the change, I called them again, and they fixed it again. No problems since.
If you have concerns, just call them, take note of who, what, when, was discussed and keep an eye on your invoice.
If you do call them, express your (my) displeasure with them for their recent data throttling announcement. I have been meaning to, and I stopped at a Boost kiosk to do so, but the young man had really no information, and I was informed to call corporate.