No, Ben.
It has nothing to do with an inexperienced customer advisor. @Illdoit2morrow has already explained this is a service that is offered by DPD.
As has been explained several times, similar to UPS, DPD allow the recipient to make changes to their parcel whilst in transit. Including the option to collect from depot.
You can’t just walk in to a DPD depot and demand to collect a parcel; regardless of whether you have I.D. or not. Unless you’ve specifically requested the service to collect, it will remain in the appropriate tote to be delivered as consigned.
You have no idea what you are talking about or any knowledge of the UK postal system. You can walk into a DPD office to collect your item! That is how our postal system works in the UK as long as you have ID.
My order is with DPD and collection requesting isn't an option in transit. This is from the DPD app on my UK iPhone X order. Upgrading the delivery does not work.