I can't get back my game on my iPhone (iOS)?

Here is what happened,
I had an account that was not saved with Game Center on my iPhone so that unsaved game is on my iPhone and I sign in to Game Center with a login that I already have an account on it because I want to switch accounts once now I'm in this logged in account, now I'm stuck I can't get beck the account that was first on my phone please help me please

What game is? Game Centre saves your score, not what level you're on… Etc.

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