I have the same issue with an account thats 13 years old.
It somehow got locked and i'm not receiving any maisl when I try to recover, even though I received mails for password change a few days before.
And how on earth should I know info from 13 years ago, support tells me to get the payment data from first memberships.
Mails changed a few times, so impossible to access...
so long story short, my maxed main account with a few skills 200 mill exp is locked for over 6 months now and I have no way to recover it.
Support only send automated messages and at twitter they tell you that you should have written the creation data down What a joke.