Victimization of clients wanting to cancel

I’ve been a client with Adt for 15 years I requested to cancel my services in January and disputed their payment was contacted by Caroline in their cancellation department who offered to give me 2 months free services to see if in April I would be in a better financial position to keep their services. In April the debit order went off again I then called her and she advised that I gave her the go ahead to debit my account which I disputed with her and asked for the recording. After that Milly Barnard called me and told me if I cancel I will have to pay for their equipment as the system is rented. I then told her that my contract was for two years and I was in full authority to cancel at anytime and that their system burned out over 10 yrs ago, the only equipment I have is their radio arial but if that is her opinion I will take them to court. I then got an email to state they will only cancel my services at end June and since they’ve still been debiting my acc. Received a call from Isaac and now I owe adt over 4000 rand because she decided to bill me for a device which I rented for two years