Wow, and a missing dine I reported on Friday was handled faster than ever too.
I decided to print my credit card transaction activity and scan it along with the receipt (since part of the receipt didn't print well), right after submitting the missing dine info online, and before I was finished I had the email from an RN rep asking me for that. Then I sent that, and a short time later I got an email back that the miles had been added for my dine and I should see it on the dining website within 24 hours, and indeed I did see it there on Saturday (as Pending).
It used to take days for each step of this (wait from online submission to email asking for receipt / statement, then wait from emailing receipt / statement to email that the miles had been added). This time it didn't even take a full hour! ^