1. Communication and consultation: First, try to communicate sincerely with training institutions and explain their difficulties and requirements. Sometimes, they may just misunderstand your situation, or have some extra information that they can help you solve the problem of refund.
2. Complaint: If the communication fails, you can consider complaining to the relevant regulatory agencies or consumer protection organizations. They may provide some legal advice or intervene in mediation.
3. Legal channels: If the above methods are ineffective, you may need to consider seeking legal help. Consulting lawyers may provide some legal advice, such as suing training institutions.
Please note that the above methods are for reference only, and the specific operation needs to be judged according to the actual situation.