Vodacom Customer Care not helpful

I agree with an earlier report about not helping the deaf. My husband is deaf and the debit order for my computer comes from his bank account to which i have signing power and my own card. Do you think that i can get help from Vodacom even though the email address is in my name?They keep asking to speak to him but won't accept my word that he is 84 years old and deaf. i needed to know who is connected to my WIfi as my data is being depleted but i cannot get through to Vodacom. I only want them to answer a query not to spend his money!! even though i offered them his iD they still refused to help me.