New W-2 Received

Today, 4/8/2020, my son received a W-2 from a company that he worked there for three days.  Those three days he was in training and did not receive any money.  The W-2 that he received today shows wages, tips other compensation  in the amount of $6377.76.  No Federal income tax was withheld.  The W-2 shows State wages of $228.06.  My son was only at this employer for three days because he had to go into rehabilitation and he has not worked since then.  What do I have to do to get this W-2 corrected?