Ok from experience with other account i had (kinda same problem)
i asked them to send again reg mail, they denied
i told send to whoever is registered ( in case they were afraid i wasnt), so real owner get it, they still denied.
Unfortunately i use hotmail and as far as i know when u delete some mail it disapears after certain time (that reg mail was more than 1 year)
Then i made a new gamehi account in order to ask through Q&A back my account (yeah as u said pretended that some1 has stolen it and i wanted it retrieve it)
i gave them whole info they wanted (reg mail also)
but they made too long till they answer...
then said that in same email (1st account-old and 2nd account had same email.. argh)
u cant have 2 accounts, so i only had to give them 1 diferent email, thats what i did
and i waited like 1 month and no answer..( just now i saw 1 answer with a 24 hours link which ofc had expired..that was summer story)
I havent seen it how it works but lets say i believe it
maybe thats 1 way, that prolly gona need again much time
and even that way,
ok i proove that i am real owner... cause through that process i gona receive some mails from gamehi(which hopefully gona proove i amnt elephant)
but how the other guy is reassured, that i wont get back the account?
the info i gona give him, (same as reg mails)
gona make his new account safe?
cause me (or a possible scammer) through confirmation mail can retrieve it back(from what i think)
or with that info he can change some things on account info that he is safe?
i am just trying figuring a way to proove :
that 1 account belongs to me
and also the other guy is conviced about that, and safe
so we have less problems in trade
only these xD
EDIT:
did what kakarot said :
so nothing, didnt worked
any better idea?