Refusing to Pay Full to a Hotel With Problematic Service

How would you plan a responsive letter to your contact at the hotel, explaining why the bank is not paying in full and suggesting future steps?

Your unit sponsored a client workshop at a local hotel. You coordinated the logistics. Throughout the two days of the workshop, the event faced many problems. You spoke with the event manager at the hotel repeatedly during the workshop to express your concerns and to try to get everything working right. You have discussed the situation with your supervisor and with your colleague, and everyone agrees that the bank should not pay the full fee to the hotel. Your supervisor has asked you to prepare a letter for his signature, which will be sent in response to the invoice from the hotel.