Sun International Poor Service

So having had a look at the dinner and dance event held at Aqua Feb 17th as advertised, I thought why not. Early bird tickets were available so I purchased 2 valued at R800. I had gotten a call from the food and beverage department at Sibaya on the day of the event as they were hosting it to inform me that the event had been cancelled.....yes, cancelled on the day of the event. I was also advised that a refund will be done on Monday,Feb 19th and refund documents would be sent through to complete. So Monday came and no correspondence, I then mailed the office and requested them. Upon receiving them, it was completed and mailed back immediately. I then get a call on Friday the 23rd and was asked to send through an approved copy of my banking details to avoid "*****"; now by this point the only ***** that was happening is my money being withheld by Sun International for no apparent reason. So I adhered, I had send them a bank approved copy of my account that was stamped last month....Got a call this morning to say that its not good enough as document has to be 7 day or less old. IS THIS THE WAY TO OPERATE SUN INTERNATIONAL??? I have to keep chasing people and following up on the status of my refund. WHY IS THAT? I frequently use Sun International Hotel in Jhb and Cape Town and I've never had a bad experience but this one instance is really making me think twice.