Refund still pendind

I had pre-ordered the S7 edge and was told that I had to pay in an amount of R3400. The Monday after the phone was delivered, I called to ask them to replace it as it was freezing. It was only collected a month later despite a few calls to follow up. There was no stock to replace the phone with so it was suggested that I go to a store to get it. I asked about the refund of my pay in amount several times and am still awaiting a reference number. I want that money back in my FNB cheque account and not sitting in some Vodacom account as I now have to go into a store and pay in there as well! Can Vodacom get their act together and sort out this mess immediately.