Delivery over charge

So on the 23/12/2021 I place an order. The system gives me two options: 1. Delivery for the next day = R95 or 2. Delivery for the 28/12/2021 = R60. I choose option 1. After paying for the order, the system delivery date indicates the order will only be delivered on the 28/12/2021. I requested the difference (R35)of delivery date options on the 29/12/2021 and still awaiting feedback.