I also have been dumped at the end of a long survey. When that happens, I email E-Rewards, tell them what happened, and include the link to the survey that dumped me. In every instance E-Rewards has credited me with the full amount of the survey.

I think E-Rewards needs to know when this happens so they can police those companies submitting surveys. While I don't know if they actually do so, I know I haven't received as many surveys that pull this kind of stunt as I have in the past. Now they usually dump me at the beginning after a few demographic questions!