The master who went to shave his head didn't clean it up and left a lot. Because of the epidemic, I wanted him to shave again four days later, but he still charged. Is this reasonable?

If you are not satisfied when you cut it, you can ask the master to repair it for you, and then pay when you are satisfied.

But a few days later, you said that it was not cut well, which was a bit confusing. Since you are not satisfied, say it on the same day. If you say you haven't cut it well in a few days, the master's charge is reasonable!