Update

I'm not crazy. And my mail is truly that bad. When I walked into the insurance office yesterday (yes, I got the issue taken care of yesterday) Diane says "Oh Steph, it's so funny that you're here. I had a call from the home office just this morning asking for your new address." To which I replied "Huh?" Apparently, all the mail they have sent me lately has been returned to them.
Isn't that nice? To which I repeat: can you sue the post office?