False advertising

I signed a 3 year data contract with Vodacom Long beach mall. On sign up the advertised deal was 30mbps line with a FUP of 600gb. I cancelled an uncapped with Telkom to take this package which I was informed by the store that this was also an uncapped. I even asked them to confirm that this was an uncapped and the speed after the FUP has been used, they told me yes and the speed will drop to 2mbps after FUP. The first time reaching the FUP the network was just cup off. When I went to the store I was told that this was not an uncapped deal and there is nothing they can do about the issue since I’ve signed the contract and to cancel I must pay R13 000. I then called customer service and they said they apologize if I was not informed but they have no way of helping me about the issue