Very disappointed in Checkers for overcharging customers

Please get your staff to only charge me for things I bought and please get your pricing right. I just came from Checkers Hyper in Brackenfell where we spent over R1700. My wife found 2 items that we were overcharged for and it took 10 min to get that refunded. We were rushed as the store was closing, so we did a more detailed check when we got home. We bought 4 of the Twinsaver paper towels to get the special of 2 for R40, but your cashier, Rushay Eksteen, put through 5, so I have been overbilled by R29.99. Wanted to call but it was after closing time for the store. Please let me know when I can get my money back. I must now drive R30 petrol out to get my R30 you overcharged me. This is very disappointing from Checkers.