Why is fiber still so expensive in SA?

So my dad recently signed up for a fiber connection in JHB, 40/10mbit for R700 pm. Some fiber installations are over 10 years old at this point so the initial investment should have been paid off by now. To make it even worse if you do an international test then you don't even come close to that 40mbit speed that you are paying for. More like 5 ish. Yet when I do a test from Amsterdam to JHB I get 100+ MBit which is reasonable. The actual cable to his house can do 1000/1000 (GPON) yet this is not even an option to subscribe.

Is the operational costs for the telcos really that high or are they just trying to squeeze customers? For reference I have a 2Gbit connection for for 30 euro (R600) pm.

Is there anyone in that industry that can shine some light on this topic?