I will try to have a polite and friendly word with the GM tomorrow morning before I leave.

The only details missing are a few rounds of:

AE: "I have to charge you $10 for the first night's parking"
Me: "No, that's not what is stated in the rate terms."
AE: "That doesn't matter. It's $10."

etc. going on for several minutes and edited for brevity for the initial posting. All the pertinent details (rate, that length of stay was within the T & C s, rate booked on spg.com, copy of T & C's confirmed on printout from spg.com, the whatevers, etc.) are accurate.

Oh, and I'm happy with my own panties, thanks, I just want breakfast!