What you are suggesting is illegal and amounts to the same thing that you are claiming happened to you. How is Turbine to know that the account you just "stole" was really yours to begin with and not someone else's? The only thing you can do is to follow the instructions in the Account Hacked/Stolen - Info to Keep it From Happening, & What to do if it is Stolen. sticky. If possible, call them instead of sending in a ticket. It will be quicker. Only Turbine can decide who the real owner of the account is.
"Everyone's got one. Better to be a smart one than a dumb one." - me
"It's people like you that [I]think[/I] you know everything that give those of us that [I]do[/I] a bad name." - me
"Eat, drink, and be Merry, 'cause Pippin was a fool of a Took."