There are 3 types of "health risk" that the cellular industry poses:
[1] Cell towers causing physical damage - the only area where the science, law and common sense converge and leaves the realm of postulating speculation in the hope of claiming consensus as definitive: Masts have fallen on houses, engineers have become injured on site etc ... The reality is that this risk to health is one which is well understood, mitigated against and is actionable when it occurs. If a mast falls on your house expect our MNOs to pay you out rather than go to court and I don't have the numbers but I suspect that you are more likely to be injured by a Telkom trokkie smacking into you or your property than a TM tower causing you injury.
[2] Cellphones causing physical damage - if you phone is hot because of use don't put it on your testicles - most warnings on devices cover this problem. The user chooses to assume this risk and the harm is greater the higher the power of the device - so the further from the tower.
[3] Radiation coming from the tower. Now on this point the current consensus (but consensus is a problematic concept in science, it is fundamentally unscientific) is that there is no credible evidence of harm caused by cell tower radiation. However lets look at the matter arguendo cell towers are discovered to cause harm and illnesses. Well we know who owns the tower and they can be sued when the evidence arrives, the only problem would be if government has made cellular operators exempt from liability - and some jurisdictions have, and no surprise should be felt when towers in those jurisdictions collapse on houses. Vodacom knows that if they don't practice appropriate care they will be nailed and so they purchase properly tested equipment from vendors who are similarly knowing that Vodacom... The cost of safety is built into the mechanisms of installation. IIRC there is a massive policy underwritten by Lloyds for some of the earlier GSM technology stacks causing harm and it would be interesting what windfalls arise to the members who bet in favour of the technology being safe when the equipment is decommissioned.
All and all more cellphone towers are better for the health of cellphone users. Now I sympathise with the homesteader who opposes "radiation" on their land and who chooses not to use cellular technology and is injured by the users of the spectrum on that persons domain. In the totality of South Africa I assume there might be 100 individuals who could make a proper case and frankly the MNOs could club together to have a legally qualified clerk consider petitions for damages and treat the matter as good will.