I'm confused - you were calling re: a reservation weren't you - ie, your Basal stay? So reservations would be the correct # for that. No idea why they requested the confirmation #. When I call in, I just tell them which property & date & they pull up the ressie.
801-468 will give you the Marriott rewards folk, so if you've got problem w/ your account etc.
800-321 is the customer support folk.
And you presumably have the gold # for reservations.
BTW - you'll note that the majority of the people posting on this thread have had good experiences. Sorry you're having difficulties. I think the only #s I use at the Plat ressie line, and occasionally the 801 line if I need to get something posted to my account.
Cheers.