1. Complain through official channels. Most online course institutions will provide customer service hotline, customer service mailbox or online customer service for customers to complain. You can reflect your problems through these channels and ask for solutions. Contact the consumer association. If the complaint fails through official channels, you can contact the local consumer association for mediation or complaint handling.

2. Use the public opinion platform. You can make your problems public through online social media, forums and other channels, attract public attention, let online course institutions face the pressure of public opinion, and further promote the solution of problems.

3. Complain to the education authorities. If you feel that your rights and interests have been infringed, you can complain to the local education authorities, such as the Education Bureau and the Education Department. These departments will investigate the complaints and take corresponding measures.

4. Seek legal aid. If you think that your rights and interests have been seriously violated, you can seek legal aid and safeguard your rights and interests through legal channels. When seeking legal aid, you need to provide relevant evidence and explanations.

5. Defend rights with other victims. If you find that others have encountered similar problems, you can unite to defend your rights. This can form greater pressure of public opinion and improve the success rate of safeguarding rights.

Relevant knowledge of educational institutions is as follows:

1. educational institutions in a narrow sense: schools of all levels and types. Educational institutions in a broad sense: including various types and levels of schools (such as ordinary schools and professional schools), pre-school educational institutions (such as nurseries and kindergartens), off-campus educational institutions (such as children's palaces and counseling stations), and adult educational institutions (such as correspondence universities, TV universities, radio universities and adult self-taught test stations).

2. Academic education institutions: such as ordinary institutions of higher learning, secondary specialized schools, vocational schools, secondary and junior vocational schools, etc. Non-academic education institutions: including training institutions and examination institutions. Fees charged by educational institutions: There are differences in fees charged by different institutions, so it is necessary to know the charging items, charging standards and refund policies of institutions to avoid unnecessary economic losses.

3. Qualification and reputation of educational institutions: Choosing qualified and experienced institutions can better protect their rights and interests and learning effects. You can find out by querying official website, checking the qualifications of institutions and understanding the reputation of institutions.

4. Professionalism and curriculum setting of educational institutions: There are differences in discipline setting, teaching quality and curriculum arrangement of different educational institutions, so it is necessary to choose a suitable institution according to their professional needs and career planning.

5. Teaching facilities and learning environment of educational institutions: Good teaching facilities and learning environment can better ensure the learning effect, and it is necessary to know the facilities and learning environment of classrooms, laboratories, libraries, dormitories and other institutions.