Repeatedly, package supposedly delivered, but pack...

Repeatedly, package supposedly delivered, but package can not be found anywhere in the house. Despite a telephone complaint, no feedback from DPD, neither by email nor in person (the driver supposedly wanted to clarify this). If you ask the telephone support, you will get snappy answers, as a recipient you will not receive a confirmation email that the package was lost!
If I have the choice NEVER again DPD!