Purchased tickets online for a time slot between 3...

Purchased tickets online for a time slot between 3:30 and 4:00 got there went thru part of the zoo before the 5:00 announcment that stated they were closing for the day my group did not get to see everything and my niece-in-law was very dissapointed and there was no time of when the zoo closed when i purchased the tickets. Really upset