OP: Things happen. But Greyhound promising multiple times that a rescue bus was coming and it never arriving, is unforgiveable. If a bus had actually been coming, they would have been in contact with it. Either a bus was never coming, or it passed you by because full. One or the other.
The bus: Prevost used to make a real quality bus. But you don't want to just sit and idle that one. Old workhorse MCI 102-DL3 was the last that had radiators designed like the old days of dirt roads; The radiator was the top half of the rear and full width, huge, pulled in air high from the sides, through the radiator, and blew the hot air straight out the back via two enormous sucking fans driven by huge fan belts from the engine, could not be better. Both MCI and Prevost got rid of that design to save a couple feet aft length for more passengers. So now they have a radiator lower left side of the engine compartment with half the intake area and twice the thickness (which doesn't work, as that air halfway in is then already hot), with a puller fan on the inside *blowing the hot air directly onto the hot engine*, TERRIBLE system. When moving fast enough, the air flowing under the engine compartment is enough to vent things. But stopped, no, they overheat. Dumb@sses. They had a good design, them 102-DL3s would power up mountains all day and not overheat. And they don't educate the drivers about this, who are willing to idle the bus all day so they don't have to turn the key to start it again. It's not 20 below where it might be hard to start an old diesel.
I'd REALLY publicize this particular Greyhound screwup. It really seems like no help was coming and they just waited for you all to disappear on your own.
EDIT: Too bad Pete B no longer runs DOT, he'd be worth writing to. But still, transport, I think Greyhound never sending a rescue bus may have violated the law or CFRs. Talk to a lawyer.
EDIT: I think the law recently changed with airlines, that they must offer you a refund, not just a voucher for another flight. May also apply to buses. Look online for info and also talk to a lawyer. Here's an article about flights, my memory was right:
https://www.cnn.com/travel/new-feder...ash/index.html