Client Service non existent

We tried to cancel our monthly subscription with ADT. We have send the request well in advance to ensure the notice month will be applicable for the month of November. They take a while before responding our subscription was cancelled. Thereafter we were informed we will still be liable to make a payment for December. Why should we make a payment. Everything was removed at end of October and notice were given of the removal of signal box. Consultant (Caroline) dont even bother to phone you back. You can leave message. It is just ignored. Until today they indicating full payment is still due for December. This is unacceptable. You can send mail, this also ignored. The signal box is lying in the Garage. No one even bother to come fetch or call you regarding the issue. Really this is pathetic. This is not client Service. They don't understand the definition of Client Service. They are quick to subscribe you but when it comes to client service then it is non exsitent???