Price difference from shelf to till

on numerous occasions I have bought groceries at the Spar and when I get to the till the prices they charge for certain items are R2 - R3 more than the prices on the shelf. if you don't say anything or check the prices they pocket the extra money they charge. <br> My husband bough bread and milk once and they charged him over R50. when he querried it they apologized and fixed the price to R35. A whole R15 more.<br> I am tired of shopping at the Spar and always have to complain for them to fix my bill. Their apologies is not good enough anymore.<br> I want feedback from the Spar WHY there is always a price difference?? And the excuse the shelf prices is not updated is not good enough.<br>