How to Change Country in Google adsense

I have some problem in Google Adsense. I created my account from country Where i have been live since 9 years ago. But next month I will be shiffted to another country due to my work.I tried to edit My adress, but can't change . I received email I should close my account if I want to change my country,team Google adsense sent my pin number to my old adress.I got confused what I shoul do.

Any body has experienced ?

Please help me.