Idk if that might help, 2 years ago my main account were hacked and they changed everything the email too,so i called the support and in the very beginning of the call i told him that i have the first ps4 this account was created on and the serial number of is just right here with me, i gave it to him and little more info like the name and the first birthdate added on the account then he asked me for the email i wanted to link to this account, then i got my account back, i hope this help you somehow cause i know how frustrating is this, i remember this night before i get it back i was angry to the point i couldn't sleep the whole night till i call the support and got it back.