If your credit card company leaves it on your bill, You may have to sue him for a refund or credit to your credit card account. But the merchant only has 30 days to dispute this.
He will have to prove that:
1) the hall was worth $1,800;
2) that he held the hall for you and turned others away;
3) that he tried to rent it and mitigate his damages
I would press the credit card company, saying that he misrepresented somethng because a mre change of mind is not enough to get you out of the contract, unless there was specific cancellation language in the contract you signed.
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ANDREA, JD, LL.M., Taxation
Member, NY & PA Bar
DISCLAIMER: The facts stated herein are information only and are not intended, nor should be construed as legal advice or legal opinion and No Attorney-Client relationship is formed by asking questions and receiving information; laws vary from state to state and to protect your interests, you should seek local counsel