I thought I was ahead of the game and applied for this account for my son when he turned 18 in May (he has an unconditional offer). They wrote back saying the application was too early for September starters and he had to reapply after 1st July.
Great, lets discriminate people because of their age. If you are older than 25, you are out of luck bro.
This promotion is actually for University students. If you are a genius and get into university before 18, then you're at a loss mate :D
But totally understand as well, sometimes it's right to just leave it and move on and don't give that bank your custom again.
I would strongly recommend using Resolver if you want to give it a shot. It makes it a click of a button to escalate the complaint to the Ombudsman when the time comes.