1. Negotiate with the organization: First, try to communicate with the principal of EF Education or the person in charge of the relevant department to explain the situation and ask for a refund. Relevant evidence can be provided to support the requirements, such as the agreement and receipt when purchasing the course.

2. Seek help from a third party: If the negotiation with this institution fails, consider seeking help from a third party. For example, you can contact the consumer association or the education department, reflect the situation to them and ask for help to solve the problem.