Bad customer service vodacom

My husband has been a client of vodacom for over 30 years,last year in july he was sent a msg that he was due for upgrade when he enquired he was told that it was an early upgrade and it would mean that he will have two contracts as the term on the 1st would not have ended ,,he then left it and decided to only do in November 2019 ,,since then he was billed for two devices and two contracts, when he went to the vodacom store it was picked up that he had a sim that he never knew existed ,,data and minutes was never used ,,so the option he was given was that he should cancel his 1st nr and use the new sim activated in November nothing has been cancelled to date despite all the emails and queries raised please can someone urgently assist On *** alternatively myself on ***