I just tried purchasing an available domain, but now it's suddenly gone after getting it.

I paid for a domain in Shopify that was just available, but now it is no longer available when I tried buying it.

The domain was shown as available on Shopify (and other sites like Wix for example), but when I tried purchasing it, my card info declined and I needed to update it. After updating it I went back to to purchase it and after successfully doing so and getting my credit card charged, I was directed to the billing info of the transaction, where it says I was refunded. It does not specify why. Now, when I go back to try and buy the domain again, it is no longer available. Not even on Wix, when it showed as available just before I tried buying it on Shopify.

I even got the email from Shopify saying “VERIFICATION REQUIRED - Please verify your domain name(s) as soon as possible”, showing the domain I just tried buying.

Why did this happen, why can’t I buy it anymore, and how is it suddenly taken? Please help!!

Contact to the Shopify Support system to get resolved this issue.
customer support. Thank you.

How do I do that? Please help