Login problem

How to emerge two accounts in one?!

I login in via FB account but it still can’t emerge the two accounts? The old one in level 5 and the new in level 15. It always ask me which one to login in?!

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I can’t delete the other account there is no Gmail option only Facebook and no delete option too!

There is no options to link it except the FB I don’t know how to get ride of 5 level account and keep the current one of 15 level

I contacted with the support and waiting their replay,
Thank you for the help.