I must pay I must R671 or Ill be blacklisted

Its been almost a year now that I was no longer ADT client after which ADT security failed me respond to the call it took them 30 minutes to respond and it took them 9 months to tell me that it was not their fault as their cars where busy that day so they had to dispatched the available one(30 minutes) and after I provided all the documents that theyve asked for from case number,list of ****** property, how access was gained receipt of the goods (Copy of emails available) I was told my claim was unsuccessful so does it mean that R46000,00 down the drain? On the 4 April 2014 I got sms from ADT saying I must call Eve from accounts department regarding my cancellation of which I did call and everything was sorted now a year later 13April 2015 I got an sms from ADT saying I must pay R671 within three days or Ill be blacklisted.Is this what they mean when they say ALWAYS THERE.Why is it that when communicating with them regarding my loss nothing was said about me owing them and why now. Can somebody please advice as to which institute I can approach as this to me its not fair so that other ADT clients must also be aware of what to expect should they brake into their propeties