So after several back and forths with marriott support, they've decided to just start ignoring me.
I have also sent an email to [email protected] which was ignored.

One of the phantom reservations apparently went through on their end because I was surprised with a charge for a no show from the Sheraton Denver this week, despite never getting a confirmation page, confirmation email, or having the reservation show up in either app. I have a ticket in now with billing which was escalated to "the controller" to get this resolved.

I am at a complete loss of what to do and if I should bother sticking with Marriott in 2019.