I paid last night and it charged me an additional $40 after I had just paid $20 to upgrade on Thursday

And now I received an email saying that you are shutting down my account.  

 

1) I paid

2) I overpaid for the month

3) JotForm owes me $20

4) if you shut down my account, I will not use this service again and I will leave feedback everywhere. 

It appears that you upgraded your account to Bronze monthly last March 3, but then you upgraded your account to Silver monthly on March 5, which is why you were charged $39. However, your account is still on the Bronze subscription instead of Silver. 

Before we proceed, I would like to confirm that you want to get a refund for the Bronze payment, and set your account from Bronze to Silver. Your account will not be shut down. We will wait for your reply.

Yes. Refund the bronze. Which I paid on Thursday, March 3, 2016.
Kelli Slack
...

I have added a request for a refund to your account. You can cancel the paypal subscription to prevent your account from being charged for Bronze on the next month.

In order for you to cancel your Paypal Subscription:

1. Log into your PayPal account

2. Find the latest payment you made to us

3. Click on your subscription number (S-8LB74409WA165310Y)

4. Click on "Cancel Subscription" button.

When you cancel your subscription you will not be charged again. But your account will stay Silver until the time you have paid for expires.

If you have any other concerns, feel free to contact us again.

It seems like you canceled the wrong subscription, your account is back to Bronze as we refunded the Silver subscription, but on April 8th, you can re-upgrade back to Silver.

If you need more room for submissions , then you can re-upgrade right away, just let us know and we will gladly assist you.