Engine heating problems to be addressed

I purchased Nexon in 2018 and drove 15 k kms so far, vehicle is good in styling, comfort and safety. But I faced engine heating issue and vehicle was stalled on highway, spent 28 k so far. But company does not want to replace engine with excuse of warranty. I will recommend not to buy any automatic variants as company is totally clueless. Also, don't take road side assistance as its pure cheating of the customers.