Nokia India — complaint against my charging port in nokia 6.1 plus

I have pusrchased my nokia 6.1 plus in november 2018, and from 3 months i am facing problem in my charging port - first of all phone supports charging in 4-5 times and it takes it around 10(ten) hours to take full charge.
then i went to nokia customer care in gurgaon - and i have described the issue to them - they have said to come me after one week as there was no charging jack was not available because most of the phone are facing same problems ..
then i went to nokia customer care after one week - they have opened my phone and now they are saying that there is a liquid damage in your phone ..
as there is no liquid damage in my phone only chargin port issue ..
please help me