Waiting for weeks for my refund

I ordered two pieces of furniture from Rochester, Atterbury on 7 June 2015, and paid a deposit. A few days later we were informed telephonically that the price was more expensive in the colour that we wanted. I phoned and requested a cancellation, and was told that I would have to come in and complete a cancellation form in-store. I did that around 21 June. Almost a month later, I have still not been refunded my deposit. I have called the store several times, only to come up against a brick wall every time. I am told that refunds need to be approved and done by head office, yet nobody can tell me when I can expect my refund. I have been patient, yet frustrated, and I think that a month is a ridiculous amount of time to wait, especially because the store would definitely not wait for money from a customer