Non functional tracker

Today I requested a logbook for the two devices I have with Nestar. I was told that the one device stopped functioning in December. My concern is that Netstar didn't pick this up and now tells me I have to test the device every 6 months. Why am I paying R167 per month. Do they just expect customers to pay and not take responsibility for their devices. I requested a refund with Javerne Naidoo. He referred me to Mr Sameul and he just told me to phone Javerne back as Javerne is aware of the process that needs to be followed. I would like to know what the consumer protections act says on charges for services not rendered. As far as I know you need to refund a consumer if they were charged for a service and the service were not supp****. This applies to all industries. SO I PAID FOR A TRACKING SERVICE THAT WERE NOT RENDERED AND EXPECT A REFUND. I can see why Altech has 641 complaints and only 40 compliments.