Viknesh PS - If you don't know your Support Contract ID, you can contact Customer Case who can direct you. They will of course need to validate you are authorized. See here Support Central - BMC Software . It is possible the customer is on a partner support contract and should go through the other vendor, but contact us to discuss the specifics of your situation.
We recommend all customers have Support and Maintenance so they can get the most out of the products, get help with they need it, and upgrade to later versions.
I think your separate post in the product group is a better place to get information about benefits of upgrading the product. The release notes will give more technical details and the account manager could help with that too.