How do I make a complaint? A How do I make a complaint? Category: Complaints We’re sorry if we haven’t got things right. You can tell us by: Calling us on 0330 159 7152. Phone lines are open between 8:30am and 6:00pm Monday to Friday. Writing to us at: Landmark Mortgages, PO Box 115, Skipton BD23 9FE. Sending us a secure message through our self-service facility. To do this you must be signed up to use the service.