Difference in price and no response to query

I contacted the woolworths customer care line regarding pricing issues. I was provided with the following reference number : *** and was told that the manager of the centurion mall Branch would call me to resolve the issue. To date no one has called me. I even sent an online query. I purchased 4 items which were supposed to be marked down. For some reason the system did not have the mark down price. I was told by staff and the call centre agent that tis is a system error. Today when I see the item it is now scanning at the lower price. I would greatly appreciate some response to the matter as I can't understand how this is possible. I am also quite dissatisfied that my query has not been resolved. I am a regular shopper and woolworths but it seems this will have to change.