Ok guys, after several waiting hours, a support agent managed to recover my account. I basically explained the same thing, I didn't say anything different. He found that I had an old EA account which was connected to my psn id (I didn't remember, from 2014), and, actually, the hacker got access to this old EA account changed the e-mail address of the account to the unknown e-mail. He basically changed the address of this old EA account to match the e-mail of my psn account and I could regain access.. I think it's about finding a good agent. Good luck guys