Poor Delivery Services

I placed an order on Sunday, and paid extra for my parcel to be delivered the next day(Monday) as they showed they have stock and wont take 5-7 days to deliver. On Monday 18:15 I get notified via app that my order has now been rescheduled to Tuesday before 5pm. Whats the point even paying extra for next day delivery if they just reschedule it anyways?? Waste of Time & Money!!!