Vodacom not delivering what I signed for

Last year January I received a call from Vodacom offering uncapped home internet for 24 months. After 8 months of using it, I started to have a slow internet connection. I called customer care to check what was going on. I was the advise to take the home router to the nearest vodacom show. Router was in for repair after 10 days I was advise to come and get a new router as that one was not repairable. Later slow internet connection again started, then called customer care were I was told that after using 2/3 of the data there is something called lock up something... I then asked what do they mean about using 2/3 as I know of uncapped not have limits. I was then told that I am not on uncapped I only receive 600GB per month. To my surprised I asked them to send me a recording of this contract. To be honest I was sent back a forth not getting what I requested. After many attempts I was referred to to admin for my request. To my surprised Vodacom told me of not having my contract recording. With a suggestion to migration of the contract if I want to use more from what I am getting. I told them to go back to a recording and send it to me to as I know what I signed for which is Home internet uncapped package. After sending Direct messages on Instagram I received a call saying the only solution they have for me is to cancel this contract. I told them not to cancel the contract but to give me what I signed for. I see another back and forth coming as they only respond when I start sending them DM on social media. I still stand that I want this contract as I took it for a reason and it's not for them to decide on cancelation when they don't want to give the recording of this contract.