Data charges

Hi There.<br> I am meant to receive an sms notification of some sort to let me know when my data bundle is running low. I have been using my data as usual... but did not receive an sms when my data had been exceeded. So without my knowledge I have been using out of bundle data because I was expecting to be notified. <br> I can't pay your rediculous out of bundle fees!! And it's not right to trick people into running their bills so high.