Non-delivery of reserved vehicle from Woodford

In June I reserved a Mercedes Benz van to rent from 27 October to 10 November. I paid the deposit that was requested. In the months since then I corresponded with Woodford a number of times, to ensure the reservation was still valid. On 26 October I received an SMS informing me that the van would be ready on 27 October from 12 noon. I rep**** that we would only need it from 4pm that day. When my family and I arrived at the Woodford desk at Cape Town Airport just after 4pm, there was no van waiting for us. We were told that one might be ready in an hour. We were asked to wait. We went next door and rented the exact same vehicle on the spot. I returned to the Woodford desk to cancel the reservation and request that my deposit be returned to me. It is now over two weeks later and I have not received my deposit back. I did receive an email from Woodford asking for my review of their service. The click-thru did not work so I am replying via this portal.