How to fix an Apple ID on iphone 7 ( ios 10.2.1 ) who has Has Been Disabled?

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I have change my passeword Id for 3 times. I have log in on apple icloud. on pc/on iphone, (I don`t have problems to log in on Icloud.)
But if i want to download or update a application from app store : " id apple has been deactivated". What should I do?