hello peeeps ... i need some help from u guys...

ive juz changed to T2 last month ... and when i received my maxis bill this month ... my data usage charges was like rm 400 WTF!!!!!!! ... but maxis has this policy of max @RM250 to be charged...
may i know any1 facing this prob or this is something which happens to HTC users (according to maxis) which i highly doubt so