I've been busy and have yet to call to switch my AWOL ambassador. Then out of nowhere, after not hearing from him for 4+ months, he responded to my request sent to the generic ambassador team email address with one sentence -

"This is all taken care of"

No greetings, thank you, etc. or even confirmation on what's being taken care of. Just these six words.

I guess Marriott just doesn't bother trying to keep its customers.