Kirloskar Submersible Pump — Body cracked after 4 years

Address:

bamunara , durgapur , west bengal , pin-713212 ,

I purchased Kiloskar 1hp submersible pumpset on 29/04/2017.
i know that the warranty period had been over, but i just want to know how did a body cracked ?
this is a brand name, Kiloskar .
but here the result after 4 years .
i have also submitted my pictures of bill and pump .