Cartrack cannot provide a recording of my dash cam order

I was contacted by Cartrack on 22 January 2025 regarding the front view dash cam. I enquired if they could offer one that recorded both front and back of the vehicle. After being messed around with installation, the technician finally arrive a week after the appointment. The incorrrect device was installed as it records front & interior of the vehicle. I now receive sms's, missed calls and threatening whatsapp message with regards to payment in spite of my request for the recording (they sent one in an incorrect format and then only the initial recording where I accepted the front dash cam and not the change from front dash cam to front & rear (not interior) dash cam. They are in contravention of the CPA and staff will not let me past a supervisor when I think management needs to be aware of my dilemma and staff obstruction and lack of knowledge/training.