Wrong information given.

I received a sms for a special on a Samsung S9.. upon phoning on the day that the special was for.. the 25th Jan. 2019... I was specifically wanting to know if I will qualify to get a accessory with the phone, as the last time I upgraded I could choose an accessory. On the call.. I specifically asked if I will be able to get a gear watch with my phone. I was told yes.. when I had opened everything and now queried with cell C , they said no. I would have taken a different deal.. as there was a Huawei with that option.. Very dissapointed. Now there is a voucher.. which I have no idea how to redeem as the samsung rewards app no longer works. I can't afford to buy the watch alone. Makes me angry that one thing is said and then it's not true..