Can Not Contract With Juveniles
Can site close my account if I made it when I was underage?
Don't know where this site you were on is located or what the laws of that land are.
But - in general - a contract doesn't even exist if you were under age.
What do I mean?
When you sign up there are TOCs Terms of Contract that you agree to at that time.
You may not have read them and you may have just clicked OK that you HAD read them.
That is essentially a contract. They promise to pay out a certain percentage in the event that a tournament freezes etc etc. And, you promise not to play multiple accounts at the same time and not to cheat etc. etc.
But no juvenile can even create a contract - so you never actually legally agreed and therefore they are not bound by anything. There is no contract even though you clicked OK way back when.
I think this is the most legalistic/technical way of describing why you are being ghosted.
And, they probably will not let you create a new adult account because they don't trust you.
Good luck !