Let's run some troubleshooting steps to fix the error,  krishna-gaddam.

Before doing so, can you tell me the exact error message you get upon trying to renew your subscription? 

In the meantime, let's renew the account on a private window. It is the best place to identify any browser-related issues. You can use these keyboard shortcuts to open one:

• Google Chrome: Ctrl + Shift + N
• Mozilla Firefox: Ctrl + Shift + P
• Microsoft Edge: Ctrl + Shift + P
• Safari: Command + Shift + N

If it works, you can go back to a regular browser and clear its cache. A piled cache can also be the reason for some unexpected error on the opened pages.

You can also switch to a different browser like  Google Chrome, Mozilla Firefox, Safari, or Microsoft Edge as alternative.

I've also added this reference as your guide in renewing your subscription: Renew my account subscription.

Let me know how these steps work on your end. Keep safe!