Never Open, but say 24/7

I work very odd hours seeing that i work in a bar. McDonals say they are 24/7 but every morning when I want to buy something to eat, they say they cant help me because of mainanance. Even if i come at 2 or 4 in the morning they closed. It is false advertising them saying they are 24/7 but they are not! This is pathetic!!!!