Nokia — battery malfunction/ keypad inflation

i am located at Patparganj, Delhi 110092, and use 1650 Nokia mobile. the battery has swelled up distinctly and is causing problems in enclosing the lid at the back. moreover the keypad has also balloned within a year o[censored]se. i fear the battery may explode. suggest a solution and nearest service centre. the dealer is not taking keen interest in solving my problem because he deals in many brands of mobiles.

Abhiroop