"I'll report back the outcome because a Marriott Bonvoy supervisor is handling it and advised one way or another all my nights will be posted to my account in about the next week."
FINAL UPDATE:
I just want to thank Marriott Bonvoy for handling this situation and resolving the issues. They've credited me all my nights and also granted me platinium extension through February 2022, since my 15 night status challenge was completed during this fiasco. Case closed.