Vodacom fibre is a nightmare

I subscribed to Vodacom in May and I ever since I joined them I hardly ever have network, sometimes I go for more than 18 hours without network and when I call the contact centre they only solution that they have is to reboot which in most cases it doesn’t help, my only solution now is to cancel because I am not getting value for money, but my issue is that Vodacom want me to pay 2000 for installation fee because I have not been with them for 12, so now my question is why should I pay for 2000 installation fee when I am not getting the service that I wanted???? Or I must just continue pay monthly subscription until 12 months just to avoid paying 2000 for installation fee ???