HP India — Laptop not working

My name is rajappan. I was in from coimbatore. I purchased a hp laptop on 5.8.2021through flipkart. I believed the brand name of hp and i purchased it. But my hope was disappointed. With in 20 days laptop got slow and battery charge was not working. We ranged to flipkart customer service they told to contact hp service centre. We contacted hp service centre they told me to put os for system and also to change battery. My question is within 20 days we want to change os?. I am so much disappointed for purchasing hp laptop. From flipkart there is no proper response they are giving. I need your help in this matter. Kindly replace my laptop. And do the needful in this matter. Once again i believing your product and hope your will replace the laptop. For your reference i attach the invoice for purchase of laptop.