Hi tamirra, what a dreadful experience for you.
I would write exactly what you have written here...
Order it, perhaps so you start with the first problem you came across (waiting and being forgotten about), and end with the state of the restaurant itself.
Be very clear and concise about the problem. My weakness (well one of many!) is that I can waffle, so I have had to learn to be quite direct. It works though. Tell them you were disappointed by their poor standards, tell them it isn't what you have been used to in the past from them (if this is the case), and if you feel confident enough, ask them what they're going to do about it! Perhaps not in such a forward way though.
Hope you get somewhere with them. As a family restaurant they ought to be very sorry!