Unfair Builders Warehouse refund process

I purchased a fridge from the Builders Warehouse online store on 5 March 2019. After following up with them a few weeks later my wife was told that they are waiting for stock. on the 26th March 2019 i called them again and after waiting for them to call me back, they called my wife and told her that the item has been discontinued and WE must request a refund. I called the help desk to request a refund and they sent ME a 5 page document that I need to complete because THEY don't keep a paper trails for online purchases.

Can someone explain to me how this is my problem? You are more than happy to take my money at a moments notice but when comes to refunding the moneys because of your incompetence it becomes my issue. I WANT MY MONEY BACK!