Thanks for coming back to us on this, Rose is off today so I hope you don't mind me jumping in here.
As this is only one main base unit, it wouldn't rule the phone from being at fault, is it possible that you could try another phone plugged into the phone socket, or alternatively if you could try your phone plugged into a friend or family members working phone socket just to ensure it is the phone that is not faulty.
I havnt got another phone to test the socket & dont intend to buy one just for that purpose. I did the next best thing & tested my phone at my parents house & it worked fine. I think therefore there is a problem with the socket. Please can someone help...I would like this sorted please.