from what you have explained I can not really fathom where the internet usage of your home broadband comes from...
some ideas:
your iPad might have been shipped with IOS 5.
Possibly you have involuntarily downloaded updates to that version (and possibly so from your several PC's, too, while the iPad was connected to them) and maybe the upgrade to IOS 6, as well.
iCloud: is that enabled in your IOS/Mac devices?
I'd call the Apple hotline for an explanation. Let them think about it, might not be an easy question for a call center advisor.
But you will want to prevent this from happening, again, so ....
Sorry that your beautiful little gadget ate up your allowance.
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