@Tommy303 I would think that since the original expectation and terms of the contract were not honored (I.e. different hosting situation), you would be due a full refund.
For instance, I removed a bathtub and replaced it with a shower, and offered all of my currently-booked guests full refunds. One did accept my offer, as he had specifically chosen my property because he could bathe his toddler in the bathtub.
I would think Airbnb would adopt a similar policy, and it’s easy enough for them to verify a change in the listing.
If I were you @Tommy303, I would keep calling and iterating on the above logic with the CS agent who answers. You might get lucky.