Why am I getting bills from ECSI (Educational Computer Systems, Inc.) from Coraopolis, PA ? How are they connected to the U/M?

Educational Computer Systems, Inc. (ECSI) is the billing servicer for The University of Michigan. They produce the statements for outstanding loans, federal and institutional, held by the University of Michigan. In addition, delinquent Student Accounts debts transferred to our department are billed through ECSI.