I have the same problem, except I misunderstood that I had to register a completion date. I thought that step happened after you completed your volunteer service. Anyway, I turned in my blankets, and went to register my date and the website said it was over.
It was only a week after they had ended it and I had no warning.
I contacted the Give a Day program and received a response today that basically said tough luck.
I think this was handled poorly and that Disney should make it right for people in our situation.
Who are you planning to call? Give me the number and I'll call too!
I just sent an email out to every Disney email address that I could find hoping for some kind of answer.
This really is sad, I love Disney and now suddenly I feel like they have done me wrong. I brag on them all the time, now I haven't even told anyone about this because I hate the idea of saying anything that makes Disney look bad. =(