Xiaomi India — Mi4i service and working problem

Address:

Faridabad, Haryana, 121008

My Mi4i xiaomi set is not working properly. It was purchased on 15 Nov 2015 that is it is under warranty period (duration mentioned is 12 months) when I went to service center they said there is some liquid that could be entered in it but it was not happened either by me or accidentally and they have also said that it could be due to sweating over ears while hearing or due to some moisture entered into it while speaking which should not be done then there will be no use of it if you could not speak or hear on phone. So please respond to my query as early as possible and it should be repaired under the warranty otherwise I have to take some legal action regarding service of the handset provided by the company.