Samsung **** - Please beware

In December 2017, i entered into a cellphone contract with Mtn for a Samsung S8 which included a 1 year cruise voucher for R4000 and a Samsung TV. Lets start with the TV, after much back and forth between myself, samsung rewards and Mtn the Tv was eventually delivered a month after I claimed the TV through the app. Now let me start with this voucher debacle, when i took delivery of the phone the Mtn confirmed that she registered the voucher on the app and the cruise voucher appeared on Samsung rewards app with a redemption date of December 2018. At no point did the Mtn consultant or based on the app voucher give me an indication that anything further is required on my side to make use of the voucher. Now whem I am trying to redeem the voucher, samung rewards is saying that i had until 15 January to register the voucher in order to be able to redeem it, where did this come from? Apparently in the Terms and conditions however this then contradicts the app voucher which states that the voucher can be redeemed until Decembet 2018. Now Samsung are saying I cannot redeem. I feel that this is completely unacceptablr given I was never informed of the additional requirement amd on face value on the app voucher it says redeemable by December 2018. This has left a very bitter taste in my mouth as i feel as if this was a blatant **** to entice customers to purchase their products. I will definitely be consulting legal opinion on this matter as surely in terms of the CPA, i have recourse against this type of wheeling and dealing.