The only thing you can do is to wait for changelly to sort it out. Keep writing support if they don't answer within reasonable time.
They have their own thread on this forum:
https://bitcointalk.org/index.php?topic=1435275But their trust feedback is bit concerning:
https://bitcointalk.org/index.php?action=trust;u=823207+ Their latest post:
Dear Customers, due to the demand that increased 4 times for the last weeks, our support team is clogged. Bitcoin and Ethereum blockchains are always overloaded, exchange partners stuck the orders under the extremely high load, etc.. We are working to expand our team, but hiring and educational processes take time. We pledge to reply to your queries in 72h on avg. We highly appreciate your patience and value your time! We suggest you not to duplicate tickets and provide hashes and TX id's in a plain text. We are able to answer at
support@changelly.com only, as we are checking social networks occasionally. Thank you for the trust and hope for your patience!