I'm tired of being ripped off!

I'm so angry right now. I just had a confrontation with the folks who run the convenience store down the street.I've provided them with computer and network support for the past 3 years and have never charged them a dime. In return, I've been allowed to run an account with them which I pay off monthly.

Today I went down and did a piece of work for them and was refused the couple of beers I was asking for as payment for almost 2 hours worth of work(Work which I normally charge 75 dollars per hour for). I was so angry I called a cop and had him watch while I tore out the entire surveillance system I had installed for them and had never been payed for. The only problem with that is that I lose the ability to charge ciggies and beer.

I wish I hadn't gotten so angry, but I really got tired of being ripped off for my work. The only thing I have ever asked them for was a couple of beers and maybe a loaf of bread. I am a network engineer, dammit! I won't stand for being ripped off like that!