Cancellation of my ADT account

I spoke to Sthembiso Dlodlo on the 02nd January 2018 inconnection with cancellation of my ADT ***. However he advised that there will be a penalty fee of R1218.85 because of signed the 24months contract. I then requested that he sends me a proof or signed copy stating that because i dont remember signing that agreement. I then called him again on the 05th January 2018 reminding him that im still awaiting for the feedback he then promised to come back to me which he hasn't. I then sent him another email on the 10th January 2018 he never even bothered himself to respond to m mails. The service at ADT is awful noone is willing to help all they want is just the money. The consultants there need to be trained about customer service cos clearly he doesnt know what that is.