I had the same problem last month. The mail from marriott came after 10 days delay. In the email from customer support was written - 'Due to an unusually high amount of internet correspondence requests there has been a delay in our efforts to assist our members. I apologize for any inconvenience this has caused. '
My points were accrued after I wrote directly to the hotel.
Sorry to hear you're having trouble getting stays/points to post to your account.
The fastest way to get this resolved is to call Customer Service at 1-801-468-4000, but if you'd like, I could also look into this for you. I am one of the moderators on the Insiders forum, along with carat, AndrewT and lindseyh, and we're here to offer assistance when needed. Feel free to reach out via private message with your Rewards number and Reservation/confirmation numbers, or hotel names and dates of the missing stays and we can have our team look into this for you.
Thanks for the post, and Welcome to Insiders
One of the moderators on here will help you.
This seems to be a common theme on here that the "missing stay" process has lost its credibility. The work around is to call the hotel, customer service or use a mod, but I don't understand why this process is not fixed. After a while, the CS agents and the mods will not have time to do their job because they are chasing points.