Never deliver on the promises

I got the new Samsung Note galaxg 20 phone in September 2020. I was one of the first clients that got it on contract from MTN as soon as it was launched. With it came a voucher and UV sterilozer case, that I had to register for, which I did. I received emails saying it has been done and got my registration codes. I then after 2 weeks received a email saying I can order something for the voucher, which I did, but it did not work. I contacted Samsung multiple times with this problem, and everyone just keeps om saying, we will get back to you or they have a backlog, etc. It is now December and still I received nothing. I have never had problems like this with Sony experia or Huawaii, if they promise you something, you receive it within days. Samsung seems to be making promises to get you to buy something and then theh don't deliver on it.