Leaving Vodacom for good. They suck.

Vodacom contracted me for 36 months and can't give me any proof that I signed up for a 36 months. Then they phoned me end of last year 2020 and said I could upgrade my contract for a lesser price and then later on upgrade my handset. Now I am stuck in it for another 24 months and I need a new handset, but cant upgrade to a new handset because their staff is not trained well and give customers wrong info and then get away with it. I have contacted Vodacom many times, without any luck. I have send e-mails without any luck. Vodacom has become pathetic and I will over time move all my contracts away from you. I have some many empty promises that someone would call me back, without any doing so. Not sure what I can do else. Can someone please help me????? please please please, please!!!!!!!!!!!!!!!