Never received my package. The driver claiming the...

Never received my package. The driver claiming the package was delivered to my door. This package was not delivered to my address as two additional service providers delivered packages on the same day (and next day) the DPD package was supposedly delivered and I received those items (left at my front door). DPD claims since I gave the authorization for the package to be left at my front door, they're not liable. I find that unacceptable since mistakes are sometimes made and someone needs to take responsibility. However, DPD doesn't want to take any responsibility. That's really not very good customer service.