Non customer friendly

My order # ***9 has reference I've order 3 items which was indicated to have available in JHB as I know when ordering not available in JHB it takes longer as I'm staying 10 km from their JHB warehouse. They also advertise the rule of if spending R450 or more, the delivery will be free of charge. this specific order is valued at R2,923 and they still requested R200 additional for delivery? Why? I've ordered more than R450 as per their own policy??? Also they committed on the app when ordered delivery will be on the 29th of Dec (ordered on the 26 Dec) - also indicated and committed to on their invoice that delivery will be on the 29th, yet this morning they changed it to the 30th of Dec? surely they have my details and can phone me or inform me when they change the delivery dates? so I pay additional delivery charge which is against their advertising and also they neglect to inform a customer that their deliveries will be delayed.