Hindware Sanitaryware Collection [Hsil] — Defective Hindware Geyser received

I bought a Hindware Geyser (Aquato model) from the Khosla BT Road showroom on the 10th of August 2021. Within a day of delivery of the item, I noticed water leaking from the appliance. I immediately placed a complaint via Hindware customer support. They sent a technician and he suggested that I replace a stop-cock from where the water was leaking. Keep in mind this is all happening within 24 hours of purchasing the product. I immediately called the Khosla saleswoman who sold the item to me. She said that she has sent an email to the Hindware company and is awaiting their reply. Two days passed, no reply came from her. Then finally, I called her and she said that it was my bathroom's water pressure that is causing the leakage. All of a sudden her demeanor changed and she started behaving badly. When I asked her, how come my previous geyser had no issue and worked perfectly for 7 years, she rudely interrupted the call. These are my issue: First, why would you sell a defective item (packed on Sept 2020) to a long-time customer. Second, Why won't you replace the item even after it perfectly clear that it is malfunctioning? The Hindware company is saying that its the duty of Khosla Electronics to handle replacement and they can't provide a resolution. My question is this product came from your company right? How can you deny all responsibility? A brand new product started malfunctioning from day one. What kind of impression does that make?
I am very disappointed with my experience. I am posting this here while giving them an opportunity to reply before I take this issue with the NCH.