Struggling to cancel account. Poor Service!

I am still waiting for some to phone me back since Thursday 26/07/2021. I phoned in a couple of months ago to test my tracking device, only to find out that it has not been working since 2020. I then asked if i can have the unit repaired as I am paying for something that does not work. They told me that it needs to be replaced because the unit is too old. I was also told that if i get it replaced i need to take a new 3 year contract. no one informed me that my device was fault and i have been paying now almost 12 months for a broken unit.

I phoned on 25/08/2021 to cancel my contract as i was told i can cancel it if i dont want to replace the unit. the guy told me that i need to pay R1100 cancellation fee as my contract ends in March 2021. I done the math, and i if had to continue paying my normal monthly installments i will pay R553.07. When i questioned this, i was transferred to customer care. Customer care informed me that my contract end Nov 2021 and only need to pay R316.04.

Why do i even have to pay anything? Why does one person tell me R1100.00? and the other R316.04?