Refusing to refund deposit as promised

I made a booking for a business trip and paid a deposit on 24/8/2015 as the hotel requested. The trip was subsequently postponed well before arrival so I cancelled my booking but requested that the hotel hang onto the deposit because I would need to make another booking later on. When the trip was rescheduled I contacted the hotel to make a new reservation but they were fully booked for part of the week I required. I asked if my deposit would be refunded because I would need to book elsewhere and they said that would be fine. So I sent my bank details. But no deposit was refunded. I followed up and got no reply. I followed up again and Quinton rep**** on 7/10/2015 saying the person who had originally helped me no longer worked there and that he would sort it out if I did not stay with them at all. I made another booking elsewhere and emailed him to inform him so he could go ahead with the refund but no reply. I followed up a few times and eventually got an email from him on 22/10/2015 saying he was deeply sorry and would sort it out for me the next morning. I waited a few more days and still no refund arrived. Subsequent attempts to follow up by email went unanswered.