Tell me about the bad things you encountered in the process of volunteering?

In fact, the most sad thing for us to volunteer in a university should be that the unit and organization where he works failed to honor their promises and awarded us volunteer certificates after completion, because the most important thing for a university volunteer is to save some credits, graduate smoothly, meet these certificates, and help us do a good job in resumes in the future. But it's really bad to fail to fulfill your promise and send us a volunteer card after volunteering.