Assualted by bouncer for asking for water.

My friends and I visited News Cafe on a night out. One of the guys with us asked for water a few times and the waiter just never brought it to us. Just before we could pay the bill and leave he asked for water again the waiter got upset and said that we were asking for too much water yet he did not bring a glass of water to our table once that night. We then paid the bill and proceeded to leave when we were stopped by the bouncer as he wanted to know what the altercation was about between us and the waiter. After explaining to him what had happened he literally grabbed me by my shirt and pushed me out, and keep in mind that I was wilfully leaving prior to him doing that. I then requested to speak to the owner/manager as it was very unnecessary for the bouncer to do what he did. I was then punched in my face by the bouncer. I was not behaving aggressively in any way or even using any foul languages and if I am lying about that, the owners of News Caf? are welcome to comment. The owner was however very apologetic and he acknowledged that what happened was wrong and he offered to take me to a doctor which I respect but none of that changes what happened. I was assaulted for no reason.