Clicks - Oudtshoorn - Overcharging again R60!!!

Wow this makes me so mad - over charged by R60!!! I can count the times on one hand that I have NOT been overcharged at the Clicks Oudtshoorn branch and the usual excuse - it's the computer or it's a special that's expired the day before - NOT GOOD ENOUGH. I try to check my till slips but I worry about the people who don't and these shops get away with it. Please don't have the supervisor Jeanette phone me and tell me they're sorry and it won't happen again - heard it so many times! I would actually like to hear something is done about it.