ROBBING PETER TO PAY PAUL

Ive got WI FI at home which my wife use because she's more home than outdoors but now i get a messages that she used out of bundle DATA Ive been to a vodacom outlet an all they say is we have to pay because its for content that just pop-up on her screen come month end they just deduct the R100 from her contract airtime according to their consultant they sell u the ph an whatever pop-up on the screen not their problem but surely these people needs to by paid for content or is it free an VODACOM pockets the money