yahoo deactivated my alt. email. cannot sign in to playstation network. please help?

i cannot log back into my playstation network account. i sent a reset password to the email i use ONLY for the psn. yahoo says they deleted my account due to inactivity. (I dont log in often if at all.) and i tried many times to get it back to no avail.
i invested a lot of money into my account and now cannot access anything on it that i bought or downloaded. so in a way. yahoo stole from me. cannot find help anywhere and playstation.com cannot use my psn ID name to reset or help me at all.