This has never happened to me before.
A while back, I did a home study using a palm pilot provided by
the survey company. I thought I followed their instructions completely.
When the study ended, I sent the palm pilot back to them in the return
packaging they provided. Yesterday I got a letter from them listing
several possible reasons why I didn't qualify for the study???
I don't know which of the reasons they gave applied to me but they
are asking me to return the $ incentive they sent in the original
package with the palm pilot and study instructions. I can't even
remember how much the incentive was. But they did give a way to
contact them if I have questions.