Severely overcharged by Checkers Brooklyn and Queenswood in Pretoria

On the 21 Nov I was overcharged for several items at Checkers Brooklyn Mall, Pretoria. This was for maple syrup where I was charged R31,99 and the advertised price was R15.99 each. I bought 8 bottles. Also, cheese advertised at R27.99 I was charged, R35.99. I queried it and after more than 20 minutes wait I was refunded R144. This made me think to check some previous slips from Checkers. Lo and behold! On 16 Nov I was overcharged for Cracker Mix. It was on sale for about R35 but I was charged a whopping R51.99 per box - and I bought 6 boxes!!!! On 19 Nov I was overcharged for cottage cheese R29,99 when it was priced at R24,99 each - I bought 2. On 14 Nov I was overcharged for Cape Mackerel R29,99 when I recall it was about R25 per 400 g tin at Queenswood Checkers.