Why did I receive an email that my account was downgraded?

Good morning, Yesterday we received this note:

Dear watchhelp, 

Your JotForm account has been downgraded.

If you have not requested a downgrade this might have happened because your credit card expired...

I logged in, check our card and all was well. I upgraded and was charged WITHOUT putting in new CC info. 

What happened!? Our company very much relies on our Jotforms as the entry point for 90% of our work. Having our forms out of commission is a HUGE deal for us. 

Do we know what happened here? We certainly do not want to see a repeat. 

Thanks for investigating :)

Mark

I have checked your account,it is active and your plan upgraded to silver.

I have investigated further, checked your invoices and billing and can't seem to find out why the email was sent.

We assure you, your account was not downgraded and this won't happen again.

Please let us know if you have further questions.