COLUMBIA, Mo. (AP) — A Brazilian education firm is suing the University of Missouri over their partnership to prepare students for college in the United States through an online curriculum.

High School Servicos Educacionais alleges in the lawsuit filed last month that the university breached their agreement by trying to directly enroll Brazilian students into its own pre-college program, Mizzou K-12 Online.

The Columbia Daily Tribune reports that the agreement states the university will enroll Brazilian students in the program through the firm, which paid the school nearly $4.9 million from 2015 through 2018.

Brazilians make up more than 4,000 of the 21,000 students enrolled in the program worldwide.

The firm alleges the university also sent “surprise invoices” totaling millions of dollars.

University spokesman Christian Basi says the school disagrees with the lawsuit’s claims.