Wrong info.given on Cell C fantasy Deal

I purchased a Cell C Fantasy cellphone on the 26th December 2017 from Ackermans at City View in Durban Central whilst I was on holiday. The manager told me that I only needed to fill 50 rand once off to qualify for the 1GB deal. When I topped up the account with R50, it only tops up 150mb instead of 1GB. I have read reviews thereafter stating that other people were experiencing the same problem and also started receiving text messages that I would have to fill R50 airtime every month for 6 months to qualify for the 1GB deal. I called the Cell C call centre to clarify why I am not receiving the 1GB and the agent told me to go back to the store as no such deal exists, yet this is on the Cell C website and in stores on a board! Thereafter I read the terms and conditions of the till slip that states no refunds on cellphones! I want a refund for the purchase as the only reason I purchased the phone was due to the fact that I needed the data and was mislead to believe that I only have to fill R50 once-off which would last 6 months!!! I would rather get a wifi router which would serve more purpose for my usage! If this is not resolved by COB tomorrow, I will be reporting this to Wendy Knowler and the National Consumer Council to take further action!!!