Nexa — corrosion on body

Address:

bm autolink, anjar airport cross way gandhidham, Kutch, Gujarat, 380205

Ear sir,
My self indrasen m mall live in gandhidham, kutchh, gujrat.
I am buy a maruti baleno car in september 2017 there registration no gj 12 da 7318.
I am also take additional warranty for two years.
We are found many place of rusting at near door, handle and back side of the body.
Pl advice what will i do. Our nearest nexa showroom not give response for this mater.
I am varied what happen when this complete after four years or eight years.
Pl see this matter.