********** Upgrade of Contract

My Father in Law, Brian Warren has an expired data contract with Vodacom. In January 2018, it was **********ly upgraded without his authority. As a 77 year old, it is extremely difficult for him to try and sort this out. We have been to Vodacom on many occasions, written to the ***** department with affidavits signed by Commissioner of Oaths, and still no response from Vodacom. They continue to debit his account with an amount that is not his account, but threaten to black list you if you put a stop payment on the transaction. How does one get this sorted?