Diane - Just to be on the safe side, send in your card. If you can't find the card, write a letter declining the extension and ask someone to send you the correct mailing address for the declinations. (If it were me, I'd send it with some type of delivery tracking so you can "prove" Disney received it). You can put a note on it that you previously called your guide if you like.
There are no records of phone calls and since they are talking "LIEN", well IMHO, it's better to be safe than sorry. While I'm sure things will eventually work out, I wouldn't want to even take a chance that I'd have to deal with any "hassles" using my points. Disney has the big stick here - anything we members could do in the event of a dispute or problem would definitely take time & effort and who knows what Disney might do while they are getting their act together. JMHO.
That sounded paranoid, didn't it? I suppose it was - but I still think it is a good idea!