Sadly I don't think or know of anyway that this is going to end.
If youve ever had an EVRI or My Hermes delivery youll know all too well how bad deliveries can be.
Delivery drivers are human with a stressfull time sensitive job, and companies can be under strain so I understand how things can go wrong but on the flip side I can also see how it can mess up a 'chain' and potentially damaging to a business and customer relationships - Ive had loads of failed collections, which meant the goods never went out therefore never got delivered, Ive had to load up and drop off like yourself, racing to the depot to make up for a failed collection to avoid messing ujp my customer.
Im not sure why DPD allow the false delivery information to be submitted, I've also had this with DHL.
Its worth reading the Saturday premium delivery T&Cs to see if there is anything to go on, sadly I believe that for me with 'next day services' I found the clauses stating that these were estimated and there is no compensation etc.
I feel that delivery companies and their staff know all too well that we need them, and they can do as they please.
For me, I never guarantee any delivery service to a customer - as life is unpredictable. It takes the strain off me and also the delivery company if 'ETAS' are not met. I think recipients should to plan a window for delivery because there is always a chance of a missed, delayed or failed delivery.
We need to adjust our expectations perhaps to avoid disappointment (hard in the times we live and work in where everything is on demand)