Sorry to hear that. This is a good reminder to everyone else of why you should try to avoid identifying yourself on anonymous surveys, even if you aren't saying anything risky. Everyone who gives their name, or makes it easy to figure it out, makes it that much easier to identify those who really want the anonymity. (Same principle as using encryption and Tor even when you don't really need it.)

People who provide negative feedback on these surveys do become targets, and not always for retaliation, but because companies (or the subgroups inside them) don't want discontent to spread, or would rather have an unquestioning happy employee they can manipulate.