If there is no way to contact the business, use a made-up generic email address (for example: support@[businessname].com) and post your complaint there so that there is a record that you have tried to contact them without success.
When you file a chargeback with your bank, be sure to mention this point:
The business lacks real customer service channels and operates with total opacity, something unacceptable in any legitimate digital provider.
If it's not possible to identify exactly what the business sells, always analyze the MCC (Maintenance Customer Compliance). Most online stores operate with digital services.
If the MCC indicates Leisure, it usually refers to digital products, video games, or online entertainment services.
If it says Education, it usually refers to digital courses or training.
If Services appears, it usually refers to online subscriptions or intangible digital products.
If the bank asks for an invoice, clearly explain that the merchant never provided an invoice, confirmation email, or any payment information, which is completely irregular.
And the key conclusion is this:
You know perfectly well that the business did not deliver anything, therefore it is the business that now has the burden of proving otherwise.
With well-structured allegations and explaining the total lack of traceability, the business will not be able to provide any valid evidence, because it simply does not have any.
Best of luck, my friend. This is the strongest way to defend your position.