Grain Dandenong Asian Restaurant

i wish to make a complaint of the grain asian restaurant located in the same level as target, me and my friend being regular visitors to the restaurant got a really rude treatment on sunday 20th august. the manager who is in charge (middle aged asian male, short hair, who also cooks)saw us but deliberately turned off the light when we were still dining there, i do understand they had to go home at 4pm but its just a matter of manner that they should have to tell you first, and plus one of their employees (not dandenong plaza employee!) the cleaning lady had to stay back to mop the floor so not sure why was the rush to turn off the lights, as the cleaning lady would turn it off before she leaves. as a result i will never go there again and hope the store manager would contact me to apologize to me and my friend for such a nasty behavior towards the loyal customers.