Chris sorry to hear about the problems you've run into. I do agree that having it a month already is in your favor. If it's paid off and the title transferred it would seem like they own in. Do you already have the new one?
Seems to me if they have it and the title is transferred they should be the ones calling WW - besides as a dealer they will get quicker response. If you are going to do it though I'd make the phone call, then follow up with a letter. Email is fine and dandy but it doesn't carry the same weight as a call and letter.