How to avoid Invalid booking from Agoda?

Dear All

Am getting many invalid bookings from Agoda via Booking.com

1. No phone number mentioned

2. Guest will not contact us

3. They dont show up

4. Agoda also not able to reach that guest.

5. Booking.com states its through their partner and they cant reach too

Unnecessarily a day gets blocked and we have to wait till midnight to mark as no-show

Please advice