clash of clans, gamecenter problem

I updated my ios 8.2 to 8.3.
After the update was finished it told me to log in to my game center. I logged in , it asked me the username again, i tried to enter the previous username but it warned me "Duplicate username". So i entered a new username . Now i am trying to link new device to my clash of clans village, but it shows this warning message

"The current village is attached to a different Game center account than the one you are logged into.

Please log out from the game center app and login again with the account attached to this village.

Then try linking again."

Please help me..