Hi Budha, I am John J.D., a fellow Microsoft user like you.
I understand your frustration, let's work together to resolve the issue. Is there an error code displayed along with the activation message?
Could you please confirm if your computer is connected to the internet? Have you tried using different networks or troubleshooting your current connection?
Did your computer come with Windows 10 pre-installed, or did you purchase a Windows 10 license separately? If purchased separately, do you have the product key at hand?
Lastly, was your computer previously running an older version of Windows that was upgraded to Windows 10?
Any additional information you can provide will be helpful in diagnosing and resolving the issue.
John J.D.