Won't hire after internship

I, along with 14 others, attended their internship program last year. They had promised to hire at least 2–3 people as full-time employees after the internship. However, they didn't hire a single person, despite our good performance. Later, we found out that they had used us to present a larger workforce to potential clients for a project that ultimately didn’t materialize. As a result, they rejected all of us for full-time positions.