1Try the agent again. Call and send a WhatsApp message at different times. Your booking lasts 7 days, so don't wait too long.
2Report it. Open My account, find the inspection, tap Report a problem, and choose The agent didn't show up or stopped answering. Tell us dates, times and what was said, and add up to 4 photos if you have them (for example, screenshots of your messages). Only you and the Zappol team can see them.
3We look into it. The Zappol team hears the agent's side too, and decides within 72 hours.
4If the agent was at fault, you get your inspection fee back (see When do I get my inspection fee back?) and the agent is not paid for that inspection.