Missy may be right, but you don't want to do that.
Just ignore the research people, and stop doing their surveys.
You're supposed to report the earnings as you earned them, not 9 months or more after the fact. Not sure how much you earned from these surveys, but you could see those earnings eradicated by false statement penalties, and possibly any remaining balance on your claim. It's one of those things where doing the right thing will be so painful that it's better to just tell the research people to pound sand, hope you don't get caught, and worry about it if you ever do get caught because the damage has already been done, and I doubt you have the money to fix things.

