@Derek-and-Jill1
Not clear how (canceled shortened ?) and by whom (Host, Guest,Airbnb ?) the reservation was ended.
Useally best option to do is:
The host must shorten the reservation to 2 nights ("change" option on the reservation).
Then renting price is calculated accordingly. If price is not correct, host can amend the price in the change-form. VAT and Taxes will be calculated also automaticelly regarding a two nights stay.
Never let Airbnb CS perform such changes, they often make mistakes.