The impresly.com domain name was only created at the end of June last year, so they've not been around for very long. Worryingly, the domain registration was made through Privacy Inc, whose purpose to hide the contact details of website owners; I know of no legitimate company that would ever need to use such a service.
There's no postal address on the website, which is also rather worrying. (A UK firm would have to include a postal address; it's a legal requirement. When overseas traders fail to provide one, I'm left wondering what it is that they've got to hide).
Looking through the eclectic range of goods on the site suggests that they're operating in a roughly similar way to T K Maxx, in that they're buying up bankrupt stock, catalogue returns, etc, and hoping that there will be a market for it. (That rather strange range of goods is probably good news though, as it suggests that the business does actually exist. Out-and-out con merchants would probably concentrate on advertising designer watches or something similar, rather than bring together such a weird collection of goods for sale).
It's also good news that you actually got any response at all when you contacted them. (Con merchants are unlikely to take any notice at all of incoming mail).
My guess is that, despite the website being configured to provide prices across six different currencies (to make it appear to be a major international business), Impresly.com is actually a one-man firm, run from home (which would explain why the postal address has been hidden).
All you can do is to keep hassling, threatening to leave a lousy review on Facebook. I suspect that you won't be the first though, as googling 'review impresly' finds these two worrying links:
https://ibb.co/Y8Q5v6j
(I can't access them myself, as I'm not on Facebook, but if you also google 'review impresly' you should be able to read the reviews in more detail).
Good luck!