Hyundai Motor India — improper service

I had a hyundai vehicle. On 17 jan 2020 my vehicle hit on the road while jump over a hump. So the oil stump was broken and oil was fall on the road. I stopped the vehicle wen the symbol saw on the dashboard. Informed 24x7 and they picked the vehicle to nearby service center and informed that oil stump has to replace. I told them cash and tine is no matter. Shud do work properly and i need the vehicle as before. After3 days they returned the vehicle and said. Everythning perfect and u can use asbefore. Believed their words i started using vehicle. 2 weeks later i had rude more than 600 kms.. Engine noise started to come. I rush into service center. They said engine problem and give me an estimate of 2 lacs and said its because of previous incident. But actually it was all corrected and with the promise from hyundai service centre i started using vehicle... It was al correct no wrong with engine. Then either it is manufacturing defect or they didnt check the vehicle properly on that tym. So after 600kms the damage was increased. And they asking me to pay these 2 lacs akmost one fifth of total cost. I think its cheating... Since my vehicle is in warranty period... They are asking me to pay for their mistake. Kindly take necessary action for the same.