A local consulting firm has made a name for itself by recovering utility overcharges for corporate clients. Troy & Banks is an Amherst consulting firm that specializes in utility and telecommunication billing. The company says estimates show that utility companies overbill customers $19 billion every year. Troy & Banks says it has helped thousands of clients.. businesses, corporations and municipalities cut costs and secure refunds from overbilling including the City of Buffalo, which got $2.1 million. Troy & Banks has more than 7,000 clients. It also helps companies save on daily utility costs and helps them go green. Troy & Banks was founded in 1991.