Commuters are upset that MMOPL didn't give any notice before hiking the fare. File Pic

Mumbai Metro One Private Limited's (MMOPL) reduction in the discount on single journey return tickets for the 11.04-km Versova-Andheri-Ghatkopar route caused a lot of confusion among commuters on Monday, who complained that the changes actually resulted in increase in fare, and that MMOPL should have informed them.