Worst delivery company

This is by far the worst delivery experience I have ever had. My parcel went out for delivery now for 4 days and it doesn't get delivered. I have made contact with an agent to confirm delivery address and my contact details. They claim they have made contact with the driver to deliver yesterday before 13:00 AND to phone me when they arrive. AND AGAIN!! No delivery. This is unacceptable. Worst delivery company by far!!