Netstar - ********

I took up a contract with Netstar when I bought my car in Dec 2018. The car came with a 3-year contract and I agreed to be paying an annual fee of R1400 which was subject to change as per inflation. I started paying from June 2019 and as the years progressed I would get a reminder from Netstar closer to the time, and I would pay (I still have proof of payments). A month ago I called them and requested to test my unit. I was told that my unit is not responding therefore I would have to upgrade, as my contract was close to expiring. I enquired about the outstanding amount and I was told that the amount will fall away. I do not understand how the amount falls away but I still have an outstanding amount.