Xiaomi - My 4 month old Poco F1 went dead and the service center is not respecting the warranty

My * months old MI POCO F* phone went dead and I took it to their service center in Electronic City, Bangalore. They opened up the phone and claimed water inside the phone when it was clearly visible that there was moisture droplets. So the phone clearly had a manufacturing defect which let moisture inside and caused internal circuit failure. MI should have taken responsibility of this defect and done the necessary repairs within warranty. But the service center asked me to pay for the repair charges which I absolutely denied as it was clearly no fault of mine. First they asked **k for repair and then started negotiating and came down to **k. I was in no way ready to pay for any repair charges and they started negotiating further. I clearly told I will take the phone back if they acknowledged the warranty and performed all repair under that warranty. They finally said they will review again and get back to me. It's been about a week after that and they have not yet got back. I fear that I wasted my hard money trusting Xiaomi.