Vodacom Bayside Mall

I went to Vodacom Bayside Mall to get a Wifi Router, it is advertised in the book as 200gig per month for R449 over 36 months, we specifically ask the sales assistant if the 200 gig is anytime data, he confirmed it was. I wanted to sign up, then I get told that that deal is not available, I get offered the same deal for R499 over 24 months. When I got home and checked the slip it said 100gig data during the day and 100 gig data at night, which is not what I was told in the store, I went back to complain and they said that the sales assistant resigned. I call the contact centre to cancel the contract, the contact centre tells me to call the store, I call the store they tell me again to call the contact centre. I am really unhappy and frustrated. I am not waiting to hear back from them to see If my contract can still be cancelled. It is exactly 7 days today.