I apologize for my late response, and thank you for all of your patience while waiting for a reply. I understand how upsetting this may be, however, we are unable to assist with payment-related matters here in the forums. You will need to go to your account online and change the payment method there. Here is a great link on how Nest Aware works and how to subscribe. In addition, here is a link on how to manage your subscription.
I'm sorry if you're still having trouble adding your new payment method. Please reach out to our Nest Aware Premier Care team to further assist you.
Let us know if you need anything else.