Over charged

I was at the Boardwalk Richards Bay. I bought two items on special. 1 Beeno Dog Treats @ x2 for R120 and 2. Comfort Dog Treats @ x2 For R140. When I look at my credit card on internet banking the amount that went off was R261.20. Yes, I know it is only R1.20 but that is not the point. I year or so back I bought a Springbok Jersey for my dog. The price on the rack was R299 but when I checked my internet bank details, I was charged R350.