Vodacom despicably cynical and useless

I had 2 contracts for my daughters - which were pay as you go and which I could top up and control. The kids are 13 and 14. I get a call from Vodacom to say the contracts have expired and are due for “upgrade”. I agree to upgrade provided they remain on top up. Instead they put my kids onto an open contract in Feb. I soon get invoices for thousands. I go to a Vodacom 4 U store in March to query - and find this out. I ask to revert to the earlier contracts and for a refund. I get the refund but not the reversion to the contracts and now I sit with another bill in excess of 3k for datA. Another 3 hours of calls later their system shows that the reason for not reverting to the previous contracts is that they could not get hold of me! Situation still unresolved - I just pay pay pay while Vodacom keep taking my money. I have now resorted to ripping the sims from my kids phones until this is resolved. Huge company behaving dispically - can’t speak to a face - call centers unhelpful and technical details sketchy poorly explained and horrible experience overall. Wits end.