MTN - Don't deliver on their contract promotions

My wife and I both renewed out contracts with MTN Pavillion on 1 December 2023. MTN advertised a promotion which included a Samsung watch and a set of earphones with the contract. We both took this option. We were told that we would receive the goods in 7 - 14 days. Since the 16th December I have tried to contact the manager at the MTN Pavillion but they do not answer the phone. I contacted the salesman who assisted us and on 2 occasions he has told me that the manager would get back to me and this has not happened. I have contacted Samsung directly and even Skynet who are the courier company that they use to deliver. Eventually, we receives one set of earphones and one watch on 3 January but not the other one!. Again I contacted the sales person who assured me that the manager would contact me by the close of business yesterday. I have yet to receive a phone call. If MTN are advertising this promotion with their contracts, they should be following up for me as the customer, not the other way around! MTN should be following up with Samsung as it is their promotion. Completely disappointed and frustrated with MTN's lack of customer care and at this rate we would rather cancel all 3 contracts with MTN and find a service provider that takes care or their customers.