I just upgraded my account and after getting my receipt, I received an email saying again that my API access has been disabled for the rest of the day

So you mean you literally upgraded your jotform account not too long ago but have still receiving an email that your account api access has been disabled for the rest of the day?

This happened because your api for your account went over the limit so this was the reason for you receiving an email notice about it even though you upgraded so I have reset it for you as a courtesy and thank you for subscribing to jotform.