Shoddy service by Vodacom

I just have to vent I was persuaded to get a new phone when upgrading in February this year Samsung A03. After a few months it froze every time. Only way to stop this was to pull out sim was informed by vodacom to bring in they "fixed it" in may same thing happened in October was told take in to Vodacom they "fixed it" again now blue tooth and location switch off all the time. It's a dud and cannot speak to someone in charge at Vodacom as they're not interested. Been with them more that 25 years why don't they look after their loyal clients. Best bet I guess is to cancel my contract. I'm sooo frustrated