BAD SERVICE

I bought 3 identical bags at RFO JHB CBD, I asked the lady to scan the price for me before going to the till it scanned at R39. 00. That's the reason I decided to buy 3 bags. Then I get to the till to pay all my items were scanned. After payment before leaving the store I decided to check my slip then I realise that one of the bags scanned R39.00.i went back to the till and I was told some shallow reason about the barcodes being different. Obviously bar codes will be different it's an identical product. I am fully aware that the RFO store does not do refunds but exchanged, I was forced to look for something to replace the bags I didn't want anymore or I must back to the store within 30 days to come exchange. My issues are as follows 1. If it is a pricing issue, which is not my fault I asked for the bag to be scanned before proceeding to pay. Why am I not granted a credit voucher?? 2. I am based in Limpopo and there is no RFO in my area, I must make a 300km trip to come and change 2 items in 30 days. 3. Your no refund policies are not accommodative as I checked my slip while still in the store, I did not wait for a day or two. 4. I have items I have no use for because of false advertising and I can't even get my back for or return because of policies and logistics being against me.