Save R20 and R15 - Consumer Complaint for PEP STORES

I bought little hero with Big characters tracksuit whereby track top is R69.99 and bottom is also R69.99 but when you take both you save R20 and winter set where by the top is R44.99 and the bottom is R39.99 and take when you take both you save R15 I never got that R20 and R15 saving then when I ask the cashier she told me a story that do not make sense. May I please have the mistake being rectified thank you