Cell C *****ed Dealings - 'Backup' SIM for Fibre is not free as advertised

My Cell C Fibre line included a SIM card as a backup for in case the Fibre line wasn't working. I was told that this SIM was free and wouldn't cost me anything. Looking at my statements, I realize that Cell C started billing me for this SIM card after 5 months. There was no notice that this was happening, Cell C just started debiting my account.

To top this off, this SIM card was never activated. I spoke to the Cell C customer care department 3 times over 18 months and their customer service wasn't able to activate the service.

So i'm paying for a service that was meant to be free, but also one that I couldn't ever use?