Nirlon Thermo Drink Stainless steel vaccume flask review: Poor Quality product 2

I purchased one Nirlon Thermo Drink Stainless steel vaccume flask of 1000 ml capacity ( product code-NR-48634) from National Handloom ltd. Johari bazar Jaipur, India before one month. After filling hot water in flask, it cool down within about 2 hours. The compony giving guarranty to keep water hot for 24 hours. When i complained about it to National handloom, they send it to compony for repair/ replacement. But compony suggested to replace cap of flask which is leaking as per their view. So National Handloom ltd person replaced the cap and return it to me. But still, it is not keeping the water hot more than 2 hrs. I want the full replacement of good quality product from compony or pay me the amount paid for that.