vodacom's poor customer service

So Vodacom finally agreed that they were responsible for double billing of a handset (affecting many more than me) and it would be removed from my bill and hey presto it's still there. Then, when there was no loadshedding and I was in wifi I lose 1,29 Gig, I buy 2 more, they GIVE me one more and almost all disappear again overnight. Can't get to the bottom of that but it makes me think when my contract is up of moving ...