Contract sold incorrectly

I got a call from Lucia late July regarding an unbeatable 10gig wifi offer for R100.00 a month which included a tablet. She emphasised alot on the 10gig available Wi-Fi (which was the main reason i took the contract), the R100.00 a month and the tablet. I repeatedly confirmed on the 10gig Wi-Fi for R100.00 as it was an offer too good to be true (a friend of mine has something similar for 5gig data at Telkom Mobile as well for the same amount). Upon recieving and connecting and trying to figure out the funtionality of this contract i went through the 500mb data within an hour. To my horror after signing for this 24 month contract and exceeded the 7 day cancellation policy I now find I only have 500mb of data and Wi-Fi - only accessible if I sit at a hotspot !!!!, explained to me by Martin - Lucias Supervisor (Who mentioned that Lucia did not explain this to me properly). This is not what I was advised and this is not what I am looking for!!!!. I am now charged R173.63 for a R99.00 contract of which I was only now advised of a capping on the 500mb. It now appears I was conned into a contract I dont want.