Don’t panic! Meditate or otherwise calm yourself and try to assess the situation soberly. Sober assessments help you determine what could be done differently from both sides. Send a polite message asking what happened and how it can be mended.  If your clients proceed with ghosting — don’t waste too much time mourning and self-shaming. Find another client and practice all your learned tactics and techniques while correcting and analyzing your behavior. Godspeed and good luck!