¿Where can Greyhound passengers complain?

When me and my friends have taken Greyhound around the country, this happens very frequently. The thing is, I don't think they have a very high profit margin. Yet, the east coast has alternative bus lines between major cities that are often half the price, and the buses are nicer and don't have the delays, and people are treated more respectfully - so it's hard to understand why Greyhound has to be so dismal.
Here are a few things that happened to us. We pulled into Minneapolis and everyone got off to use the bathroom. We got back into the line to reboard, and this line included about 20 new people who had bought tickets. Greyhound has no idea how many people are already on the incoming bus when they sell tickets, so the 'excess' people in line have to sit and wait for the next bus in 3 hours. We were towards the end, so they directed some of the new people to sit in our seats where we had our coats and bags, and the driver didn't comprehend that we were reboarding, and tried to shut the door on us. We essentially had to get angry and have one person stand in front of the bus and have the other force our way on to grab our stuff from where the new people were sitting. Back at the ticket stand, the other people who couldn't get on were dutifully trooping back to get ticket refunds (if you pay with a check, you can only get 90% of cost!), and we complained and got $5 candy counter vouchers. Later I wrote to the company to complain, and they send us $80 ticket vouchers, which was nice and unexpected. It's sort of like Greyhound just has structural problems.
Phoenix was a totally miserable station where they were humidifying the 100F air, which made it worse. There was an hour long line of really poor people leading to one ticket agent. AT the loading dock, there were about four lines forming at 8 doors, and when you asked people in the lines what the destination for that bus was, they were for all sorts of different places, because no staff had announced what the line was for. So I picked one. There was no system of 'first come, first served' so you had to stay in the line and couldn't go sit in a chair, which is painful for elderly or people with kids. When the bus to Tucson came, the driver scanned the scene of ~120 people who wanted to board and did 'women and children first', which caused fights to break out. Some of the poor people essentially would have to wait hours for subsequent buses to show up.
Greyhound will do things like out of necessity, pushing out all the passengers at 2am in Fargo to wait for a new driver. There was a lady in our bus dying of cancer, and she patiently was waiting in line. In Cleveland, the staff was abusive. They told us to wait in a reboarding line for a bus in an hour, and three hours later things were barely starting to move. Even though we view ourself as laid-back non-whiners, there were several occasions where me and my friend were the only assertive people who finally broke down and complained. This totally came from the fact that we are middle class, and the working class people who ride more often were more used to the abuse and not in the mood to complain. Finally, about 40% of Greyhounds have someone with a personality disorder onboard. The drivers get worn down by them, and delight in cases where they get to kick them out at a rest stop for getting drunk or breaking a rule.

What are you complaining about? It's Greyhound for Pete's sake. Take your cheap ass off Greyhound and spring for a flight, or rent a car. When you're paying nine dollars to travel, don't complain when you don't get first class treatment. Stop being cheap.

APPARENTLY THIS GUY IS A STOCK HOLDER WITH GREYHOUND!