Debited for a call out fee even though I pay for the maintenance fee

I have been waiting for the past 3 months for cartrack to rectify the mistake they made. I even wrote a review here and they responded that they will investigate but it’s still quiet. I’m the one who keeps on calling several times and the accounts department keeps on “logging the tickets for a refund” and they always come up with different answers everytime I call, I always have to start the process from scratch! I want my money! I was told I to add the maintenance fee on my bike so I don’t have to pay any call out fees when technicians come, I only pay for the device if they need to change it. The technician came and they had to install the new device and when I saw an invoice, I noticed that they added the extra r600 call out fee. I called them and they were investigating for a while. They deducted the money regardless “those ongoing investigations” that do not even come back with feedback. I always call!! I want my money back and you must train your employees correctly to know your products and not make these mistakes that you can’t even rectify now.