Hello ApoorvaJ,
Go into your ‘World Settings’ and try changing the values under ‘Lightmass’ to help hide the seams. One setting in particular to pay attention to for your issue is the ‘Indirect Lighting Smoothness’. Set this value to something around 0.6 and see if that helps improve your issue.
Let me know if you are able to get your mesh to look correctly, or if you need further assistance.
Cheers,