thats a pretty bad bill
similar thing happened to me when i changed my plan for my cellphone. i got a national plan. and basically they erased all my other option like my text messaging. so i was paying 10 cents per message without knowing. and i'm suppose to still have my free unlimited text messaging. good thing one of the person i talked to made a note. but she didnt add it on. so they took off my $90 charge for text messaging