Special ends before the time

Yesterday before 18h00 I attempted to place an order for the Nescafe special 3 for R249. The special was running until 8 September (yesterday). When I checked out before 18h00 the price suddenly charged to the normal price of R124.99. I immediately logged a ticket via email *** & *** with no response until I called at 11h04 and spoke to Cecilia who informed me there is nothing she can do as I did not place the order. No logic, how can I place the order when there was a price discrepancy. Asked to speak to a Manager was told they are busy and cannot take my call and will call back. This is bad customer service. How can a special end at 18h00 when the delivery app is open for deliveries till 20h00 and logistically the special should end at midnight. I would like to pay the advertised price and cannot be told that ooops sorry, the special has ended today.