Over pricing

On 2/4/2021 I needed a refill for my Soda Stream. The refill is the model 60. I was charged R412 less R100 for the empty. I checked on the Soda Stream website and the recommended price is R150. I confronted the manager at Sediba Spar Hartbeesport and his only comment was that they charge the same as the other retailers (Checkers and Pick and Pay). That was the way he dealt with my complaint about the massive cost. I told him the recommended price and he was not interested.