I'm having a bit of an issue with them currently too.
Something was delivered by DPD, with someone else's address on it, but also mine. I queried this with the deliveryman, and he said it didn't matter, mine was the right one.
Cue opening it up, and what a surprise, it's not for me.
Contacted the other addresse, and it turns out they've been given someone else's stuff too, but not mine.
And the next person? You guessed it, they've got someone else's stuff.
DPD then came and collected the parcel from me for return to the company.
Two days later, and it arrived back with me, exactly as it left me, in exactly the same packaging!