Refund

I bought a bluetooth headset from Total Sports in Canal Walk in April 2014. It went faulty a couple of weeks ago so I took it back to the store. They refunded my Markham account as this is how I bought it. As I've been paying it every month, the refund caused my account to go into a credit of over R1200. I was told by the call centre that I must go to any Markham store to get a refund as they do not do it at head office level. I went to Markham in Tygervalley who confirmed with the call centre that this must be done, but they didn't have enough cash in store, so I went back today (Tuesday). The store checked with the call centre again, only to be told that I now have to supply bank statements since April 2014 to prove that I've been paying my account. Really? They can see that I've been paying it but they want more proof? There is no way that I'm providing even one statement. I don't mind if I get refunded into my bank account or cash at a store, but this needs to be done this week still as I've been getting chased in circles.