Xiaomi India — mi 4 problem

I purchased mi 4 from amazon on 2 dec 2017. Still in warranty. I insert headphones in headphone jack after it mobile is not working properly. When i received call no voice in ear piece and ringer is not working. I go to mi service center first consumer care executive says there is a issue in mother board i don't have a part please comes after 3 days. When i go back to service center they said we don't have part still it's will be comes 10 to 15 days. I said to them ok make a job sheet and keep this phone, i will wait 10 to 15 days.. But they don't do this and now they says some liquid found in charging area.. Now warranty is not covered... Please solve my problems...