Guess you're angry because you didn't get this

"I stayed there quite a lot last year as a Plat and was well looked after, but this year I moved up to Plat Premier and have had suite upgrades, personal greetings from and an offer of being escorted to my suite by the guest relations manager, baskets of fruit in the room and personal, handwritten cards of welcome."

which you posted on your last stay.

From what you posted above I think you have some quibbles (the doormen & the have you stayed here before), but IMO overall you're over-reacting. And I'm only speaking for myself, but I wouldn't drop a place based on a 1-time experience, especially when your prior experiences went over what we're all entitled to as Plats.

I am a bit confused on why you bothered w/ the front desk when you know you can go to the exec lounge & check in there?

Cheers.