I recognise that many people working in customer support roles have lousy jobs with lousy wages and are treated like dirt by customers and by bosses.
So my first approach is a nice, short, letter explaining the problem and asking for help. People like to help, and they like to help nice people. If I get help I always follow up with thanks to them, and if possible I find a manager to write to saying how pleased I am that a problem was sorted out by $NAME.
I agree that having your name attached to some childish ranting is not a good approach at all.