Hindware Sanitaryware Collection [Hsil] — Chimney leakage issue

I bought a hindware chimney model Nevio Plus 90, (Serial No.: CHYFPBGEVGGV7XHJ) around 4-5 months back. Within three month after purchase I faced an oil leakage issue in my chimney. I reported this issue but no one came and to resolve the issue. Even no one called or message me for delay in service.