Update
My Customer has been able to successfully recover the account and register his personal e-mail on it.
Thus both of us can confirm that the account is SAFE http://prntscr.com/ljt7b9 and http://prntscr.com/ljt7fv
However both of us would still like Staff to take action on @Marwan44 in the light of protecting fellow community members from having to deal with the same situation.
I believe that the user has mentioned to me that he is, as we speak, working for other community members, and I strongly believe that having read and proved what he's done with this customer, he should not be let off at ease after this situation.