Horrable service provider

I had a 36-month contract with Altech netstar for vehicle tracking. No one at their service desk told me that I should test the device twice year...when I finally had doubts about them not being able to see where my car is, I found out that I had to test it twice a year. I then went to a test station and tested the device but never got a response. Following day response came saying my device is out of warranty and that I have to pay for reinstallation or whatever fees they named. I got soo upset as the unit has only been installed in my car for less than 24 months and was never told that i will have to pay for another installation before contract laspses. After taking up the issue with Netstar at their 16th road, Midrand offices, I cancelled my contract on 22nd January 2018 and demanded that I be refunded for paying them while their device was not working. The guy named Aswell assisting me there promised that they have cancelled my contract and will find all the communication recorded between us and them. deadline for feedback was 31 January. Noone ever called me from Netstar...all they ever did was to debit my account YET AGAIN FOR NOTHING. BAD COMPANY WITH HORRIBLE CUSTOMER CARE...I WANT THEM TO PAY BACK MY MONEY.