WORST EVER SP

I am supposed to have a 50mbps fibre line, but the best I can get is 11.93mbps, but I am paying for a 50mbps line. If you phone them, all they tell you is to reboot the router, but that does not help, if you ask for them to send a technician they just ignore it, when I asked for an SR number I was told it whould be mailed to me, but nothing has happened. All potential clients if you are looking for fibre, please don't use Vodacom, you will regret it.