For this kind of thing, you need to be prepared for two things: First, satisfy your rights. The other is that "safeguarding rights" fails or the cost is too high.
In China, this kind of illegal behavior is relatively common at present, and the relevant departments generally lack supervision. Maybe you are still a young man who has just entered the society and suffered this kind of loss for the first time.
Personally, I suggest you make two preparations. If you really don't achieve your goal, you will "spend money to buy lessons."