Vodacom *****elently upgraded my contract

I had a contract with Vodacom it was supposed to expire in May 2022 then vodacom *****elently upgraded my contract from R288 to R922 without my permission I never even received the new phone. When I called them they said I upgraded in joburg and I told them that I never did and I stay in Mpumalanga. I called them many times, went to their Twitter page, sent numerous emails to their *** address no answer, one day the made me hold for more than 25 minutes only for them to tell me that they will call me back. I'm so disappointed