@ Mr.Sachin
1-I think u wud hv to pay the tax which u r is required to pay according to assessment order n in case ITO accepts its mistake ,if any, then u'll get refund of tax paid in excess.......
2-You have to change ur address in ur PAN card so u hv to fill up the following form
https://www.incometaxindia.gov.in/archive/changeform.pdf
n u can find info regarding this on-