WORST Customer service I have ever experienced

To date, there have been 26 issue numbers I have been assigned and this is STILL not resolved. In April of 2017 I registered for a promotion and met the deadline, got an email saying it was confirmed and I would receive notification when it had been sent....fast forward 3 months later when I made the 1st 3 hour call and was told to be patient...Here I am, almost 1 year later with still no promotion sent. I have emailed AGAIN, transcript I have had and that does not include that I have also been on the phone with Samsung promotions, Samsung commerce, and other various departments that I have been transferred to 10+ times at 3 hours each time. You have the absolute worst customer service I have EVER dealt with and will recommend to anyone that I can reach, this issue. Tell them, if given the choice, based on getting help from your team, they should buy another brand. I am due to upgrade my phone and I am considering an iPhone when all I have ever owned was Samsung. I stayed with you after having my phone recalled 2 times , the last which was on the day I was leaving on a business trip for Europe for 3 weeks and HAD to have a phone. I stood in the store for 4 hours before my flight to end up be given the phone that I had originally upgraded from. Now this….I am STILL waiting on a call back from a supervisor and 8 months after requesting it multiple times, have yet to receive it.