Refund outstanding over a month! Zero interest received from Woolworths in getting this sorted out!!

I purchased ONLINE on 26/10 for 5 items, for the amount of R1672.65. On 30/10 my bank account was debited for the amount of R1528.38, as apparently the one item that I ordered was unavailable. I have been relentless in emailing them requesting my R1672.65 refund, which has now been outstanding for over a month, yet I have gotten no joy! They couldn't be bothered even getting back to me!! DO NOT PURCHASE ONLINE FROM WOOLWORTHS!!