If I cut it off from the wifi - what happens?
Why not ask for a copy of the contract making obligatory for your mother to have broadband for the benefit of the electricty supply company? On whom does the contractual liability fall if for any reason the broadband service fails?
What you describe sounds extremely dodgy. IMHO a formal complaint ought to be made, rather than just flagging it up on this forum.
Biting the hand that feeds IT
