A similar issue has cropped up with us and I have posted on MSE (not allowed to use a link but the title is Orange Warning/Heads up. No idea what has happened and I am 100% positive that my son has not knowingly used this data amount. He always uses wifi when he can and would not be 'streaming' on his data allowance. This has never happened before - he has had an ipone for 2 years and is not irresponsible. If Orange could see there was unusual usage, why didn't they say? Ovvioulsy because they can make money this way. I don't know how we challenge this but I am determined to do as much as I can.