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I asked my DPD account manager about this.
I wouldn't say the sun shines from their backside but seems like the majority posted here have had good service from DPD, I can understand your frustration here as it's not really all to do with the item not being delivered but more than not being able to speak to a human to resolve the issue afterwards.
DPD's contractual relationship is with the supplier, not with you.
But they made one mistake, so they're useless.
If the recipient needs to check whether anybody in the household is going to be at home, or if they need to check whether a neighbour is going to be in, or if they want to review other delivery options eg deliver to shop or collect from depot , then the more time they have the better.