"The man was overcharged." This is a neutral statement of fact. It suggests that a mistake was made.
If the man was intentionally charged more than he should have been, then "the man was cheated."
If the man was willing to pay more than the normal price because he got better or faster treatment, then "the man paid a premium" or "the man was charged an extra fee." For example, "he paid an extra fee for front-row seats in the theatre," or "she was willing to pay a premium for reservations on the faster train."