Vodacom services is pathethic!!

My name is mohamed hoosen arbee and i have a vodacom contract.. In june i upgraded my contract with vodacom call centre and they told me they wil put me on a, R149 10gig day and 10gig night contract. My son spoke to them on this upgrade and asked them if they were any additional charges and they said no. Every month i have been billed different amounts since then. I have made several queries and in October they agreed to keep me on this contract but lock the line when my data is finished.. Today my fone line is suspended second time since i have taken out this contract.. Every time we call the call centre they have different stories regarding the package im on.. I refuse to open up another complaint with them as the last one took over a month to resolve.. They need to get they act together and listen to all the voice recordings. How do i go about contacting consumer act to get this problem resolved once and for all and it is frustrating me now to keep calling vodacom all the time.. I want this contract cancelled at no cost because i was given all wrong information regarding this contract from the start. Please advise what i should do?