Incorrect pricing on shelves vs till slip

I would like to warn Woolworths rewards shoppers to check their till slips as 3 times in almost as many months I happened to notice that I have been charged a different price from that marked on the shelf when it comes to WRewards. I have since taken the most recent product back to the store and they did give me a refund but my question is why should this be up to the shoppers to check and as I say this is not a first instance? The store told me it was the fault of head office when capturing data so I took the trouble to contact customer care to advise them of the situation. Below is the response I received which need I add I was appalled with. Talk about passing the buck / uncaring attitude / total lack of customer care / bad attitude. Is this really how Woolworths wishes to portray their customer care??<br> <br> \Thank you for your email