I Bought A New Truck In April. 2 Weeks Later The Dealer Called And Wants Me To Sign New Paperwork.

I bought a new truck at the end of April. Over 2 weeks later the dealer calls me back saying "the promotional loan rate we offered you was never actually offered by ford credit. We need you to come back in and sign new papers but it will 'work out' better for you."
I have already applied for title on the truck and have insurance listing the loan on the contract.
What are my options here? I don't really want to interact with this dealer more than I have to. I went as far as calling the consumer protection bureau and the person on the phone said they had never heard of this happening before.
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