Pathetic

I cancelled my contract with these people because they useless with their response times arriving at my house hours after activation or even not response when panic or alarm goes off,i cancelled them 02/2014 and paid my last bill and did not hear from them till 01/2016 advising they handed me over to debt collectors for what reason noone can explain or provide me corrispondance to where they contacted me for any outstanding bills, no a debt collector calls you demanding money and Adt ignores your request for assistance yet they reffered you,now they missing and no response <br>