When feedback gets rejected, the endorsers don't get an automatic refund on their endorsement points, and must instead withdraw it manually.
Rejected feedback should instead issue an automatic refund of all endorsement points on it, just like when feedback gets implemented. There might be a case for pumping more points into a rejected suggestion to get the point across that it's wanted; this should be done instead by reopening the feedback since we won't see the rejected feedback anyway.
The feedback also remains open to comment, and might benefit from being closed along with the refund.