False adverti*****t

My wife took out a contrac with mtn the phone she took came with a Samsung R2000 voucher. As soon as we were done with the paper work and she got the phone she was told the promotion has ended we had then showed them the promotion is still running.they agreed and looked into the matter the voucher then could not be redeemed she was then told to contact Samsung herself so she did that.she was told its not a voucher but R2000 in discounts on selected items that it does not say anywhere on the ad The person at Samsung then told her it is the customer responsibility to go look up the terms and conditions as to what the promotion is about the people at mtn didnt even know that and was also shocked