Not for sale as the advertised price

I have purchased a coat from Truworths in Kenilworth on the 29th of July, there was only one left and I took it, as is was also marked down, or so I thought. When I paid for the items, the cashier informed me that I cannot have the item for the price on the tag. The manager intervened and said that it has been tagged incorrectly - not my fault. I thought that was highly unfair. I was awaiting feedback on Friday the 31st as agreed. I eventually called the store today, whereas the manager informed me that I couldn't have the coat for the price on the tag as communicated from the area manager.

The Consumer Protect Act clearly states: "A supplier must not require a consumer to pay a price for any goods or services: higher than the displayed price for those goods or services; or. if more than one price is concurrently displayed, higher than the lower or lowest of the prices so displayed."