"My transaction did not come / go through" "Exchange completed, but funds did not arrive."
If you see this "Sorry we are unable to locate this transaction hash" do not be alarmed. The Ethereum network is congested at this time and it could take up to 4 hours to appear on Etherscan. Please do not open a support ticket until at least 4 hours has passed.
For example you will see this:
Please update your ticket to say it's been solved if the funds do arrive later.
We are working to clear a backlog of tickets and appreciate it if you do not open a ticket prematurely.