I have to supervise their customer care staff
I am the one who has to nudge my delivery to progress forward. Today, I have had to phone DHL 5 times before lunch in order to get a status update or for my package to move through the phases until delivery.

I have had to act like a supervisor to DHL, correct them and waste my airtime because they can't even call out of courtesy.

This is the last time I use the service.