I am also having this problem, I had made reasonably significant progress in the game, and would really appreciate getting all of that back! I believe that it might have something to do with me not having played the game for some time, and then upgrading to a new phone. Now I am unable to access my previous game canter login, and get the Game Centre ID conflict error. I could get into the game and started the tutorial a bit. Then I decided to log out of game centre and login again. Now I no longer get the error, BUT I DONT HAVE ACCESS TO ANY OF MY GAME PROGRESS!!! I am stuck in the tutorial mode!

I'd appreciate some help with this please!! Will I get access to my data if I complete the tutorial? Or is it saving over my old profile data now!?!?