Discover Credit Card Complaint

Discover Credit card department,

Credit card protection / Debt protection Illinois

For a medical service my wife made an advance payment/booking on - - -/-/2014 using my credit card ( since they offered - time yearly discount during that period ). The payment was done via phone. The transaction was not a signed transaction. My wife was supposed to receive the service by - but she re-scheduled the appointment to - due to her medical condition. She called that clinic by - and the number did not go through. So she waited for a week more and did not get any response either. When we personally went to the place to our surprise the place was locked and no attendees to address our concern. This is a huge amount for us and we did not except the company will not render the service they have paid for. Later when we researched on internet and found that the servicing company has filed bankruptcy. We raised a dispute with the bank and a temporary credit was provided for the amount. Now after investigation the bank had denied the dispute mentioning no sufficient documentation. Kindly let me know what can be done at this stage?