https://changelly.com/about

Not sure if the typo is yours, or you went to a phishing site that was missing the E.

The link above is their site, at the bottom is contact email, g+ fb and Twitter.

If you were on the site, contact them. Using all the contact methods.

I thought they had a slack. But i don't see it. Might check freenode and reddit too. (If you don't know what freenode is, Google that last)

If you went to a phishing site, there's almost nothing you can do. You could file a police report, but it won't do much.

Have your tx ids

Have your tx ids handy.