Vishal Mega Mart — Steel water bottle

Hi I am from shimoga Karnataka
Before 2 months back we bought 2 steel at bottle from Vishal mega Mart, for my kids, 1 St I took bottle to home there is wiered smell was in that bottle, so I add liquid soap and hot water in it wash, it next day morning my kids took bottle to school, daily i wash that, after 15 days later one day I checked bottle there was very bad smell in it, then I took bottle to Vishal mega Mart shimoga, we directly contact with manager and gave bottle and told to smell it, he refused to took action against our complaint, argument and some other customer also support us after heat argument he took complaint I told we will call you, again 1 month later we went to their again he told there is no defects in our piece you should buy the bottle in exchange of that bottles we again check bottles in store there was a smell in that, we spoke with another manager he also told there is no smell in bottles, so I request to company please take serious action on it otherwise you will pay for it