Look, all you employees supposedly answering (not) questions from all your dissatisfied customers, who, by the way, pay your salary... You are most definitely ripping us off! The fact that you arbitrarily take your payments from our living expense accounts before we can even see the bill is completely underhanded and most likely illegal, no matter the contract! We, as your customer base have a legal right to at least be able to prepare for whatever amount you are deducting, especially in the case of each month's charges changing depending on use.
Have you ever heard of the term "DUE DATE" usually a 10 to 30 day grace period, so people who are on a fixed income don't get charge with extra overdraft fees from their bank accounts or credit cards? Some of us live in remote areas and our very survival depends on the internet as our only resource to the outside world and it's to us!