I feel for the OP, as he shelled out a ton of money only to have a sub par experience. I would be just as pissed. Im also wondering what you are asking for? I have had bad experiences much more trivial than yours, and after a direct conversation with a Marriott employee I've walked away with 25,000 points. Perhaps I missed it, but what exactly are looking for. I bet you would be able to get 30,000 to even 90,000 points if you are forceful enough on the phone. But if your asking for $1200 back, or something like that, then you are probably .... out of luck.

I would also advise against doing the CC dispute. If you never intend on going back to a Marriott property or have no MR points left, than I say go for it, nothing left to lose. However if you have a decent point balance, and some status with MR, by opening up a CC dispute you could be flushing that account down the toilet. There terms and conditions are pretty liberal with their power, and by disputing the charge, they could just blackball you from future stays and close your account. The rental car companies are notorious for doing this.

Also on a side note. The autograph properties, in my experience, often play by their own rules. They are very loosely tied to Marriott, essentially just for the rewards program. Frequently I have issues getting my points and stays to show up into my MR account. Numerous times I've shown up at autograph hotels, and they have no record of my reservation even though I booked at MR.com It does not shock me that you are having this level of trouble with a autograph property, For this reason I often avoid autograph hotels. MR is probably giving you the run around because the hotel is giving them a run around.

All in all, I hope it works out for you, and I at least hope you enjoyed your stay, because the pool being cold should have been a blip not an absolute disaster.