The CC update card button on your billing page does not work.

I tried in 2 different browser but your change credit card button does not work. I tried in private and public mode. 

We apologize for the inconvenience, the past-due status was interfering. We had to remove it, and put your account back to free plan. It should now let you upgrade using a new card, please follow this guide: https://www.jotform.com/help/331-How-to-Upgrade-My-Account