By the way, I know this is a separate post, bu just for those who may miss it as part of the above long post.
You CAN get a refund for the bundled OS from manufacturers like I wrote

Here:
Linux.com :: How to get a Windows tax refund Getting a Windows Refund in California Small Claims Court Quote:
A clause in the Windows end user license agreement (EULA) says that consumers who do not accept all the terms of the license can return the software for a full refund. When Paral brought this aspect of the license to the attention of Lenovo, the company agreed to pay him roughly $130 for terminating the license.
In order to complete the agreement, however, Lenovo insisted that Paral sign a nondisclosure agreement that would effectively bar him from talking about the deal. Paral refused, then took the story to AbcLinux.cz, which gave him an equivalent amount of money for telling his story to the world.
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Lenovo won't refund the Windows tax without an NDA Israeli Linux fan squeezes Windows refund out of Dell ? The Register Windows Tax - Can You Really Get A Refund? ~ The Blade by Ron Schenone, MVP How I got a Windows Vista refund from HP | equiliberate Italian court rules against HP on pre-installed Windows ? Channel Register CNN - Windows license opens door for Linux refund - January 25, 1999
Bottomline: Yes, with some patience, its possible

How much it ll apply in India, will depend on how customer friendly the company wants to be