Taking Customers For A Ride

Would like to make customers Aware . Please check your till slips.Cannot recall how many times Spar advertises "SPECIALS" , needless to say the checkout till slip reflects the NORMAL price. This infuriates me, as how many pensioners or elderly check their slips? Always the same excuse " looks like it wasn't changed on the system" .So how many customers have been cheated out of their discount . Wake Up!!! What have you got staff for?? Do I have to continually point out your errors?? Do your jobs!!