You can go back. But you need to change hotel booking to some city that can accomodate you. If city has flooding, hotel can't take you in. That is the reason why they didn't let you in, you didn't have a place to stay that was available
The ask:thailand community, consisting of multiple Q/A groups with over 100,000 members, powers this platform. It is not an official government resource. Our members actively contribute to this resource, and while we strive for accuracy, we cannot guarantee its complete reliability. Assistance to travelers is provided as a community service.