Vodacom is the absolute pits

I am at my wits end with Vodacom and their incompetence. On 11 October, one of their " sales agents" phoned me and offer me new contracts for my kids. I was planning to stop these contracts, but she was very convincing. However instead of the 10GB contracts for each kid, there is now a 10 GB for one and 100 GB for the other. I have spoken to so many agents and even a 'line manager' about this and this still has not been resolved. Just got "new" contracts again this morning, like I have not spent hours on the phone. Vodacom is the absolute pits. I am a client of almost 20 years, but all I want to do now is warn everyone to stay away from them.