Disclaimer: I've actually only ever encountered this once. I work with IT and had to raise a support case with Microsoft. They did ultimately solve my problem, but it was clear along the way that the case handler had serious communication problems. After the final call, she asked if I would mind doing a survey with her supervisor. I agreed to this, but it very soon became obvious that he was just there to groom me for the official Microsoft survey that's always sent out as a result of these support cases (standard procedure and until now has always been in a non-aggressive automated email, so I've never minded them). He asked me how I would rate the call handler, and I explained that I hadn't made up my mind yet, but that we had had some communication problems.
"We've been having some problems with our phones, so that's probably why." (No... the problem wasn't that she couldn't hear me). "Please do rate her high - a 9 or a 10".
When the survey came, I filled it out, rated her a 7 or an 8 (because she did eventually fix my problem, even though it took a LOT longer than it should have!), but rated my overall satisfaction only 5 and explained, "I would have rated this higher, but I was prompted very forcefully by the call handler's supervisor to rate the call high. I did get a solution for my problem, but I did not appreciate being pressured in this way."
They'll probably ignore it, but if possible I'll leave such a comment whenever I'm pressured to leave a high rating.
If the survey is just "dumb" ratings with no means of leaving a comment, I just don't fill it out.