Samsung rewards ****

I've upgraded my contract at MTN in December of last year and got a R5000 MSC cruise voucher with the phone and the lady said that i can redeem the voucher when I'm ready because i didn't have enough leave at the time. So today i called Samsung rewards and the lady said that i should've registered before the 31st of December and I've lost the my opportunity for the cruise. I wasn't inform about it at MTN at all. In fact we called the Samsung rewards guy numerous of time that day and he didn't pitch.. So now i cant redeem the voucher because i want given the right info at MTN. I'm very upset at Samsung and MTN! Please call me so that we can fix this!!!