Usually, a single mail to the support team should suffice.* From what I can tell there are currently a lot of support requests - so the team would need a few days until they can even read your mail, then contact the admin (if the transaction really went through, then this behavior is some kind of bug) who in turn has to take some time to figure out what happened. And then they can respond.
.* Giving the other party some time to check the situation before sending a second request for support about the very same topic is not only a good idea but common courtesy.
If you saw an error in red directly on the card page then it sounds like the payment did not go through.
In our system, if the payment does go through, you will receive an email receipt regardless of where you ended up (for example, if you closed the tab by accident or your computer crashed). So if you don’t receive that email then your payment was not processed.
Hope that helps
