Is this something that you noticed repeatedly or is it an isolated incident that almost happened to you that one time when you managed to double-spend your coins?
Every single order I created today at the site was rejected. It didn't matter what I used for he email, IP address, etc. I think I tried like 4 times.
Customer support has no idea why coingate is acting like this either.

This
reddit case might be similar to yours, though it’s unclear if the OP ever received a refund, as there haven’t been any updates in over two months.
In your situation, you’re actually lucky to have received the email before the transaction was confirmed, otherwise, getting a refund would’ve been a much bigger hassle, with delays and inconvenience likely.
I don't know if they are related. I was trying to renew a seedbox, which always worked before. Not buy a gift card. And Stripe even worked.
So at this point it no longer has anything to do with money. I'm just trying to figure out whether they (coingate) is trying to boot me out as a user, which makes no sense because they are just a middleman with no authority over this sort of thing.