TRYING CONTINUOUSLY TO CANCEL CONTRACT!

On Monday I phoned ADT to request the email address to cancel my ADT contract as I don't get called when the alarm goes off and the service just gets worse and worse. On the contract we signed, it says 20 days notice. I received the email address: [Email Removed] I called again on Wednesday and was advised that they are still to contact me as the letter has not shown on their side and they will call us on Friday latest. I was told it is 30 days cancellation notice! Then I called today and was told its a calendar month notice and the letter still doesn't show on their side! He gave me his own email address [Email Removed] to send the letter to, which was wrong! My cancellation was in on the 12th October and I want this cancelled by 12th November! I want confirmation to confirm this has been done. I am so disgusted with the lack of service and that you won't let me talk to cancellations directly!