Then you might want to be careful. If you operate by yourself and no one brings the bill, it may be your bad luck and market analysis. Suggest stopping the suggestion. If a teacher brings you a bill, be sure to watch out for scams! After all, there are only four countries recognized by the state, but there is no such platform as yours. I don't know if I have been cheated. Can you tell me something about yourself? If you are sure to be cheated, you can also communicate with me to defend your rights. I hope I can help you, and I hope I can adopt your reply. Thank you!