First, you don't have an express contract that students don't want to continue to participate in the teaching of training institutions, and the school will refund your tuition unconditionally.

Second, even if you hold a receipt, it does not have any actual legal effect.

Third, if you have the above two points and have consulted legal channels to prove that you can refund the fees you want, it is also a waste of people and money. After all, the number is small. If you really go to court, you might as well charge some fees.

What's more, at the beginning, you only paid the fee because both parties volunteered. Even if you regret it, it will only increase your troubles. It's better to solve it yourself and study in a different mood. After all, there is no regret medicine in the world.