Re - my post above - I did get credit for 2 surveys, but I have not the faintest understanding why! I got kicked out of several surveys and then was told I had exceeded the daily limit. But I had not even gotten to complete one - so how on earth did I get credit for one that I got kicked out of??!!
Because I knew I had not actually gotten a survey completed, I did try again.
And now I am dismayed to see that I got double credit again. Hopefully I don't get any trouble for it, because I didn't TRY to get that!