If your item was sent from Germany (sorry if my assumption is wrong), then it will go to a UK hub, very possibly in London, before being sent on to you.
If you look at the email you received when you paid, there will be a range of estimated delivery dates.
One day after the latest estimated delivery date, you should open an 'item not received' case.
You do not need to contact Customer Services.
You can report an item not received using the button below:
Report item not received
"There are two ways to be fooled. One is to believe what isn't true; the other is to refuse to believe what is true.”
Søren Kierkegaard, Danish philosopher (1813 - 1855)
