False Advertising and bad service from Managers

Wrong stacking of goods. Checkers Norkem Mall advertised Plunger 800ml for R49.99. When I got to the till it scanned for R149.99 I did not agree with them as there was a row of the R49.99 plungers and then a other row that was R149.99 next to it. When My Wife took them to the shelf where it was standing they just appologise then moved it to the R149.99 leaving the row empty of the R49.99. I feel that it is wrong to do it like that as it was not my fault it was advertised for R49.99.