Rip off. I reserved a car online but when I got to...

Rip off. I reserved a car online but when I got to the counter at L.A. airport the actual rental price was considerably higher. The attendant would not honor the price I reserved. He had no explanation as to WHY he was charging me so much more. Unfortunately I was in a rush and couldn't stand in another line for half an hour at one of the other rental car companies. I complained to the manager. He said he would upgrade me to a better car, but I ended up in a car almost identical to the first one. Never again.