I noticed you already posted on Coreswap's official thread. But since Coreswap's representative here has been inactive for months and he/she probably won't be notified of a new post on the thread, you might also want to send a direct message. He/she might get notified via email.
Other than that, Coreswap's staff mentioned
support@coreswap.io. You may also send that address a message. I don't know where else you can contact them. Their reddit account is suspended, their Twitter inactive, as well as their Github. It seems their Telegram channel and the rest aren't available.
It appears this service isn't serious at all, perhaps even a scam. I'm, therefore, afraid your money is gone. But send them a message, just the same, and provide all the details. You don't just scream 'scam', even if it is, without producing a single evidence.