It is illegal for a training institution to expel students, which can be reported through the local education administrative department and the local industrial and commercial administrative department:

1. Complain to the local education administrative department: Students can complain to the local education administrative department and ask the relevant departments to investigate and deal with the behavior of the training institutions.

2. Complain to the local administrative department for industry and commerce: If the behavior of the training institution violates the relevant laws and regulations on the protection of consumers' rights and interests, the trainees can complain to the local administrative department for industry and commerce.