If this happens, just keep your SurveyMail email in a pending folder and after 30 days email CS saying you completed the survey but weren't credited. They almost always credit you 10 points for your efforts. Be sure to include the SurveyMail number (at the bottom of the email) in your CS request.
It may not be worth it for 10 points, but when I started noticing points not posting, I created a Pending folder and as points post (to MyPoints, AAdvantage eShopping, etc) I move them out. It doesn't really take any effort on my end...