S8 offering with MTN contract not honoured

I took out an MTN S8 contract with MTN on black Friday in November and I am still waiting for the 256gb sd that was part if the deal. MTN have advised that this is a Samsung reward advertised as part of the contract and out of their hands for their delivery plans. I have followed up repeatedly and Samsung rewards can still not give me a date when I can expect this. Consumer protection? Please advise what else I can do as to.me this is just not good enough and I shouldn't have to accept this attitude 2 months later.