1st time in Vegas and we picked the MGM Grand. Hot...

1st time in Vegas and we picked the MGM Grand. Hotel is nice. Casino could have better slots selection. Biggest problem I had was, they would not offer us a late check out. I called the hotel in advance to confirm that I could do this and they said not worry, just make sure I had it in my booking notes (which I did). When I checked in, I reiterated this and was told to go down the night before to make sure they could do this (tonight). I just got back to my room from having a very unpleasant experience with three front desk staff (1 worker & 2 managers). They told me that they could not give me a late check out because the hotel was fully booked but I could go online and book a room for two nights because that's their minimum. I said "you just told me the hotel was fully booked but I can go online and book for two nights??? That doesn't make any sense!" I offered to pay for another night so my mom and I could keep the room until we had to leave for the airport. They said no, that's not an option because they're fully booked but I could go online and book a room for two nights. This is the dumbest thing I've ever heard. They said it's corporate policy and that's all they can do. Keep in mind, I called the hotel to confirm this before booking my flight and hotel. The manager said that they do offer late check outs for 1pm, 3pm & 6pm for an extra charge. I said "Great! I'll pay extra to stay until 6pm." The manager said "sorry but you had to do that at booking." I said "but I wasn't told that or offered that, or even had an option for that when I booked." He then said "yeah, you're not suppose to know that." Huh?!?!?! I'm suppose to do something when booking that I'm not suppose to know about?!?! This was the most confusing and stressful conversation I've ever had!!!! On top of all this, I have two medical conditions, that doesn't allow me to sit for an extended period of time. This is why I needed an late check out to accommodate my medical problems, which I was apparently suppose to do when I booked but I couldn't know anything about it!!!! Come on MGM, this is the most ridiculous thing I've ever heard!!!! Clearly I will never stay here again!!! Thanks for all the extra stress!