Disgusting Service ever!

When I moved into my new house end of February 2018 I wanted to reinstall my alarm from the old house into the new and ADT wanted to charge me R1400 just to remove it and same amount to reinstall. So an agent came to my home to try and sell me a new alarm and it was way to expensive for my liking. I then opted to cancel with ADT and go with another service provider then the sales lady contacted me and begged me to stay with ADT. She then told me upon her second visit that they could fix my old existing alarm. I then agreed. The installation technician came he said that it was not possible to make my old alarm work with there system as I thought it would be. The agent still never got back to me since then and I have reported it to Courtney Adams at there office and she told me that someone will sort it out but nothing happened. They have debited my bank account last month for the installation but nothing was done. I just want to cancel my service with immediate effect!