I have a xbox360 gamertag which I used for many years, I recently bought an xbox one which my partner set up for me whilst I was working. Unfortunately my email address was linked to a different gamertag which I have recognised from my steam account on pc. This one was assigned to me because it wouldn't let me use my xbox account ( not sure why, I tried several times). Now I have a gamertag I don't want and I wish to have my original gamertag back. Any help would be appreciated.