Can I be held liable for a group's hotel cancellation charge without a signed contract agreement?

Question Details: I am a home based travel agent. About 11 months ago, I contacted 3 hotels to get a quote for a small group traveling for 13 rooms. Then, 4 months ago, at the time just prior to departure, I received a call from the hotel representative asking if the group was still coming. I said no, that the group cancelled their trip. At that point, I was told that my credit card would be charged a cancellation fee of over $2000. I do not have a contract for this nor any of the other hotels I contacted. I called and emailed that hotel representative to forward a signed agreement for me to examine. There is none. My bank has cancelled the charge back and paid the hotel, leaving me owing my bank the charge. My banking institution says that my releasing a card number made me liable even in the absence of a contract agreement.

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