Incorrect Charge

I am very disappointed with Woolworths Cashier. I have been over charge twice in one week . First I bought 1 X kg Pork Ribs BBQ on the 10 October 2017 and they were marked down by R30.00 but the Cashier charge me the normal price R169.99. Today going to solve that query which was not resolve as Patricia did not seem to know what she was doing, I decided to buy few items and I bought a Granpa Paracetamol 20 Tabs (special was buy one and get one free). When i arrived home i realised that i was charged for the full price, which if R24.99 X 2.

I honestly don't know what going on and how many times i was overcharged before when not checking my slip.

This is so irritating that i have to drive all the way just to be ******