White van man is often given too many deliveries by his greedy employer in the first place. In the second place, he is often trying to deliver to house without a name or a number on the door, or at the end onf a long drive with the name beside the doorway, and unreadable or invisible from the road. Doorbells often don't exist or don't work, householders often say they were in when he called, in spite of his having battered the door as loud as he can. When they say "I was in" what they mean is, they were about, in the garage, in the garden, in the loo, in the shower, etc etc.
Then when you do find them in there is the pantomime of not signing until they've opened it, to check if it's intact.
It's OK sir/madam just endorse the signature unexamined.
No I need to check.
OK I'll wait.
"This is not what I ordered, take it back"
I can't.
Why not?
Because it says TNT on the van outside, and your parcel came from Harrod's.
You collected it surely you can take it back?
Madam, this is Inverness and Harrod's is in Knightsbridge, I didn't go down there and collect it myself so I could deliver it to your door for the princely sum of £3.50 per parcel!

I've been there and done that, and it is a very frustrating job, so try and look at it from the other side please.

Giok