Event vendors who no-show or badly under-deliver leave a clear paper trail: contract, deposit, and what was promised.
Cite the contract, the deposit or total paid, what was promised vs. delivered, and a refund deadline. Attach the contract, receipts, and any proof of the service.
If ignored, small claims (up to $10,000 in NYC) handles most of these, and a deceptive vendor can also draw a consumer-protection complaint.
Generally yes for a vendor who failed to perform. The contract terms and your proof drive it.
A non-refundable clause doesn't protect a vendor who didn't perform. Demand it and, if needed, let a court decide.
Give 10 to 14 days in writing.