Continued poor service

Follow on from my previous complaint as I still seem to be getting no where. After my previous complaint I was eventually contacted by Marcia in Finance to listen to my issue, to which it seemed she understood why I had cancelled my subscription and admitted it was a faulty unit and that Thato M (Supervisor in Customer Service) should had advised her about my continuous calls regarding battery disconnect issues in March. I thought I was getting somewhere until I had to follow up again on 23rd April as I had received no feedback after her call to me on 15 April. I was advised by email that the "hardware and admin fees are non-refundable as per our internal policy". I requested that both hardware units that were removed out my vehicle and taken by Netstar to be returned to me as I was now paying for the hardware, and that I was not made aware of any fees upon cancelling. I continuously mentioned in my emails that the cancelation was due to a fault on the unit and bad customer service and I was not paying any admin fees. Once again it was highlighted to me "Please note that hardware and administrative fees are non-refundable as per our internal policy". Again I reiterated that if Netstar had provided customer service I would not have needed to cancel. I again requested for the two hardware units to be returned to me. No response to date! In a separate email also dated 24 April I requested for a reference number to be provided to be so that I could follow up with Webuy Cars about my refund. No response to date! My question is. What will it take to get service from Netstar, or do they enjoy frustrating their clients? It seems the latter!