Contract cancelled 2014 still received bill!!

On the 14th of January 2014, I cancelled our contract with ADT with immediate effect.<br> On the same day I received an email with a ticket number EC4F8D452AC33 from ADT confirming email. On the 2nd of February 2014 an invoice was issued to us for R377.56<br> I kept on phoning your offices stating that we did pay for January and that the invoice for February 2014 should be cancelled.<br> <br> On the 16th of May 2014 I complained once again to your offices and an email was send to me from Katlego Modisane with FOU845 JH, saying that someone must contact me as I stated we do not have to pay for February 2014. <br> NO ONE contacted me and the last email ever received from ADT was on the 16th of May 2014 for the phone call. I never received any other correspondences from ADT or any calls.<br> On the 2nd of June 2015 my husband received a sms stating he was handed over to Debtsource for collection? More than 1 year later?!?! Once again I tried to phone, but was told the email for the Director is personal. I forwarded an email to customer center and to ntsotetsi.za@adt but still no response. I also contacted Debtsourse but received an email that they are waiting for a statement. What now?!?!<br>