Hewlett Packard India - Replacement or refund not provided for defective product

I bought the said laptop on **th May **** which I received on *st June. But on booting the laptop I found that it was having slowness issue. Full boot up of the laptop too sometime and was not at all smooth. Simple programs like Word, Powerpoint etc was taking time to load, Hp preloaded software takes much longer to start. And also after performing some basic tasks like preparing some documents in Word, web surfing and playing preinstalled Solitary game, the laptop got heated so much I was unable to touch the keypad, as the internal fans were not started on it's own. After working for over an hour, I restarted the laptop and the process took more than ** mins to restart. I have made a * min video out of that time as proof. Also "Realtek AudioAdmin background process is preventing you to restart" message also comes when I am shutting down or restarting (Snapshot attached). So I raised a replacement request with Flipkart on *nd June ****. Flipkart forwarded the problem to HP who just created a case against that. On *th June, I got a call from HP, stating that the case has been escalated to the service team and on **th June, a technician came, infront of whom, the laptop didn't start until the charger was connected even though the laptop was charged at ***%. Even though I clearly mentioned that I won't allow any postmortem of the new device, yet he opened up the laptop saying that he needed to take the motherboard number. He even made a video of the RealtekAudio Admin background process preventing restarting/shutting down problem. he asked me to show him the invoice and mentioned that as Flipkart didn't provide the serial number in the invoice, so he won't be able to proceed with the case.
I called up the HP service center after he left and the service center asked me to take the visiting technician into conference, and on hearing that the invoice didn't have the serial number, the service center told that he'll drop an email to the PAM to proceed with the case.
Till now all am getting is daily call and email from the HP that the case is being escalated to higher authority.
Meanwhile the laptop has already started to show more slowness as well as random disconnection with my Airtel Broadband wi-fi. I have to restart the whole device to get it connected to the wi-fi once again.
And on **th June, when I played a pc game at medium graphics for * hour and after shutting it down, I wanted to open word, so I clicked on the "Type here to search", and was shocked to find that the page was loading. I have attached the snapshot for the same as well.
I fear that they are dillydallying the process, so that I may give up or worse they may come back and tell that the item cannot be returned anymore. Please help me in getting this laptop returned and the amount refunded.