Poor quality line installation

I had a fibre line installed to my premises in May of 2019. Less than 8 months later, it has failed. They sent a 'technician' (I have clothes older than him) that spent as much time playing on his cell phone as looking at the line, who eventually said he can't figure it out, and left, saying the line would be reinstalled. Next day, I get an email from a Vumatel subcontractor, saying I have to pay R 1 725 before they will reinstall the line. If I buy a cheap plastic kettle at the local supermarket, it comes with a 1 year guarantee. Not Vumatel lines. They just blame the failure of their equipment on the customer...