We waited a week for a delivery which should have been next-day, only to then receive a letter informing us that DX had attempted to deliver... but as an office building, we are open all day, and clearly nobody had attempted delivery!!
This is equivalent to a child with a paper round who dumps their bundle of papers in the woods, and then lies about it!
And then they are impossible to contact to re-arrange delivery, having to call to be given an email address, which then doesn't work, and there's no-one on the website live chat either.
To sum up in one word - inept!