Why am I unable to upgrade my account?

I am currently using Free Version.

Tried upgrading to Bronze.

Chose Card payment method etc clicked on 'Continue and received the following message:

Upgrading to JotForm Bronze Plan

 Your card was declined.
To update your billing details please click the button below

I did not get a chance to enter card details, yet I automatically received the decline message.

I would recommend you to follow this guide and make sure you're selecting credit card as payment method: https://www.jotform.com/help/331-How-to-Upgrade-My-Account 

Also, in case you're still experiencing the issue, please provide us a screenshot about the error message you're getting, this guide will help you doing so: https://www.jotform.com/help/438-How-to-Post-Screenshots-to-Our-Support-Forum 

We will wait for your response.