This is an impolite way to invite the accuser for attending in front of judge in court.
For sure they have done something big, from the picture it appears that they have to return money taken or a bank loan.
From history I knew that some parents are not satisfied by the level of the school, they left study in this school and have asked politely to return the fees but school played ALIBABA, I saw same school in problems on the board of the commercial chamber, ministry of trade and business and Supreme council of Education in additional to a complaint in the British Education website.
In fact after the manager was changed the new management is trying to prove that they deserve the salary so they are just damaging the reputation of the school.