They keep putting up the cost of service. They have no vulnerable persons register. They write to you asking you to contact them for a service visit then want you to stay in all day which isn't always possible because people with disabilities work too. They refuse to send out emails to confirm appointments with reference numbers for visits. Time to find a better company that looks after its customers, particularly those with disabilities...and that understands customer security for people with disabilities. ADT, I think you're in breach of the Equalities Act in the way that you run your services.
They offer a remote fix if your system breaks down, even though you've phoned up for the annual inspection appointment and then forget about the remote fix, rendering your system useless.