*****ulent marking off Delivery status

Incomplete delivery was missing 2 items, the driver could not leave the 1 item and had to take that item back as all 3 items need to be delivered together, order it now 4 days late due to this and the driver marked my delivery as " delivered"on the App. According to the customer service consultant it is a system glitch that marked the delivery as delivered. No accountability and the consultant refuses to provide me with the escalation process???