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I wanted to cancel my service with ADT.
I called them and inform them that I moved to another security company and the sent me an incorrect form to move to another address (the operator probably misunderstood my request). I filled in the form and made a note on the form that I am CANCELLING my service.
I received an e-mail reply that they will contact me but after 4 days no-one did.

I also wanted to cancel about a year ago and the telesales lady promised a cheaper option, but my debit order was for the lower amount for the first month only.

This December my alarm was struck by lightning and when I called the call center the told me that I have to wait for 2 to 3 weeks because the technician is fully booked.
Needless to say we had to cancel our holiday due to a non-functioning alarm.