I don’t know the email connected to my account and I want to change it

Ragnarok127

I’ve been trying to get the email attached to my Kabam ID switched for a while now. I’ve sent multiple tickets and been denied plenty of times because i don’t know all the exact information like the date I made the account and the original name of the account. I don’t have access to the email account it was connected to because it was my school email so I can’t get any of the information either. Is there any other way I can prove ownership of the account. I have been playing for years and have put plenty of my own money into the game.