S2725QS, return, have not received a return label

Can anyone help me.  I bought a Dell monitor it is a 27” 4k plus S2725QS. I decided to return it on the same day it was delivered. The return was approved on the Dell uk website. I received an email saying take the monitor to the UPD drop of point and when it is root them and processed I wit receive a refund accept I was not sent a return label. I have tried to contact Dell UK by phone but all I get is automated I cannot reach a person the automated hangs up on me when I explain my issue. When I go to the order exchange box it says process already initiated and I have yet to receive a return label. I have written a complaint on the complaints page no answer. Any ideas on how to contact Dell about this problem.

Wayne