Google Adsense Application Disapproved

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Well ! I am unable to Understand why adsense account not approved by google, as now its 3 to 4 times they give just one reason i.e. Issues: - Contact address incorrect,incomplete or not provided Well I have correct my address and well i know my correct address but i am unable to understand why every time they give above reason, can any one explain me but to do and how to approved my adsense account..