Tod-
Do a web search on Centerline and find their corporate address and place an immediate call to the attorney general in that state-They will tell you how to file a complaint-It brings a little more weight than the BBB who know-one is afraid of- Then do periodic reports to the AG in the state.
I believe this will get them investigated-and maybe the hassle will help square the deal a bit-Their hassle to offset yours.
I know you want the wheels, but I think you have been more than patient and you are a customer with RIGHTS.
Just my two cents,
Scorp