This is weird, in my case it was a glitch and it was fixed on its own within a week, but by that time I had already disputed the charge with my bank, so it took them another day or two to realize that and give the pay button again, I ended up paying again and everything went smoothly from there, the thing I know for sure is that their support was the most unhelpful thing I've ever seen, I'm not sure what's the best action but I hope it works out for you.