Stolen card is a different type of thing. In that case they need to prove that the card is stolen (like from where the transaction is made and so on, there are procedures). And it often takes a while and several calls from the bank during the investigation. It was like that for me also 2 years ago when I got my card stolen. They called me several times to ask me questions.
Btw, there is a procedure in all banks called dispute request (chargeback request). None of the banks will give you the money back to your debit card without the knowledge of the seller. Imagine how many free items or service you can get if that's possible. So it's not about Revolut.
To open a dispute the transaction needs to be settled. After that Revolut or any other bank can give you the option to fill the form and start the dispute procedure where the seller can place their arguments against it.
After you submit a dispute the card issuer will review both arguments and make a decision (it depends on the bank). Most of the times when the seller doesn't submit evidence against the dispute you'll receive your money back.