I have had issues with DPD deliveries 4 times over the Christmas period.
Once on Christmas eve when I paid for the next day delivery of a special Christmas car for my new wife. He said he had tried to deliver but the bell never rang.
Secondly, when I was waiting on some drinks/favours for our wedding. Again, the same problem, pretending they attempted to deliver.
Thirdly, a present for a friend's birthday. Again, pretended a delivery but no bell rang. 'Tried again' the next day but again, no bell rang.
We have tested our bell the day before this delivery and know it is working
DPD are the worst delivery service I have experienced and would not recommend them.