Kia picanto street 2018 broken

Me and my wife bought a new car from kia herm**** the enjin broke they need to replace the enjin, the car is 4 months old 3650km on the clock so the kia picanto street 1000cc broke so bad that they have to replace the enjin so I think they must give me n new kia picanto street 2018. If I want to sale the car the people is going to ask me why is there no new enjin in the car