I had to sit down on that one ChAoS. I got dsl installed a few years ago from bellsouth and it was just like that.
They sent me 2 dsl router kits. I returned one via express mail and they had to sign for it. They charged me for 2 still. I called, went through about 8 people over 5 days and finally got a "supervisor". He says to me, "Oh, I see a note that says it was returned over a week ago. you will see the refund on one of your next 2 bills".
DOH!