MTN does not deliver

MTN makes promise they dont keep. Went to MTN cresta May this year as they were having a promotion upgrade your cell phone and receive a free Samsung Fitbit. Well that's exactly where the problem started went to them and upgraded from a Samsung 7 edge which was and is a great phone to an S9 as I was due for an upgrade and was getting a fitbit sounded like a great deal. When I upgraded I was directed to the Samsung sales lady as she was to install the Samsung Rewards on my phone well this app never worked from day 1. I was supposed to track my fitbit delivery with this app. I went shopping one Sunday and received a call from the courier service that I was to come home immediately as they were delivering an item to me till this day I do not know what they were delivering as I had no prior warning from anyone as to when my fitbit was to arrive needless to say I did not go home as I had not completed my shopping and with the crime rate the way it is I was also a little apprehensive to say the least. But to make a long story short with all the back and forth I still have not received my fitbit till today. MTN tells me to phone Samsung and Samsung tells me to forfeit the fitbit my contract was taken on condition that I get the fitbit and I have not signed any contract with Samsung but yes with MTN so I feel this is their mess to sort out or let me cancel my contract and I will return this phone