Breach of contract and Legal handover

My tracking device has not been functioning since early 2016. I was alerted by Cartrack in June 2016 while I was admitted in hospital after an accident. I made them aware of this and requested that an arrangement be made at a later stage to fix the device. In October 2016 an arrangement was made to service the device. After disputing what the real issue was during the service appointment and what I saw as misrepresentation of facts by either the supervisor (Shane) I was speaking to telephonically or the technician on site, I requested the matter to be escalated. Whilst all this has been happening, I was paying monthly premiums via debit order for a device that was not functioning. The matter was not escalated as requested and the last debit order I allowed from my account was on 17 October 2016. I stopped any further payment to Cartrack as no services were being rendered to me. I then started to receive threats to be handed over to credit bureau by the legal team (Kim Peters, Ashley Naidoo) and credit controller (Bomolemo Ditshetelo). I indicated that the matter had been in dispute for the reasons stated above and no one entertained reaching an amicable solution to the problem. I fitted a tracking device with another tracking company for the security of my vehicle. I received a cancellation letter after indicating via email to the legal team that I would engage an attorney and the Ombudsman. The cancellation had no indication that I would be handed over for collections nor did it outline that I had an outstanding balance. I was under the impression that this matter was closed after receipt of the cancellation letter. Cartrack later handed me over to Creditworx after forwarding me a cancellation letter in May 2016. I am now bombarded by calls from the Creditworx call centre. I escalated the matter to the supervisor (Lerato Molahloa) of the call centre. This call centre does not have a communication tracking system and I am left to answer calls from various people although dealing with the supervisor. This surely is an infringement of my rights as a consumer. I had been with Cartrack for many years and never missed a payment, why is it that I am expected to honour my part of the contract while they failed to honour theirs? I want this issue to be handled by withdrawing my name/account from Creditworx because this is tarnishing my credit image for an issue which I am not at fault to.