This happened to me once, back when I still had the Wave Crest card. It took ages (a month) for the blocked funds to be available for spending again.

There are two options: 1) if the merchant (the online shop) is trustworthy, contact them (the merchant) and ask them to reverse or cancel the second transaction or 2) dispute the transaction by contacting Cryptopay who in turn will contact the card issuer to initiate a charge-back or a dispute of the second payment. The dispute will take time because Visa will give the merchant an opportunity to defend itself from your requested charge back. A lot of time. Weeks (in my case it took a month). I didn't dispute. Wave Crest told me if the merchant doesn't settle the second payment, Visa will automatically credit the funds back to my card. And they did.

If you want the money credited back to your card ASAP, you must proactively work on the matter by contacting the merchant. The merchant should reach out to their bank and have the second payment cancelled and Visa informed of that cancellation.