I wouldn't expect any response.
I had a deposit go missing one week ago because their server was down. I sent a clear and polite message with transaction details and a link to block explorer. Since then I've messaged them several times and they still have yet to respond.
As for their ICANN details, the administrative contact lives in NJ and the email is email@example.com
but don't bother emailing them because it will bounce.
I have since removed all of my funds and I have them stored in my own desktop wallet now.