I think this is the application legislation that you could struggle with...
NO. 103 OF 1996: TELECOMMUNICATIONS ACT, 1996.
Page 46
Removal of pipes and facilities
73. (1) If a fixed line operator finds it necessary to move any telecommunication facility, pipes, tunnels or tubes constructed upon, in, over, along, across or under any land, railway, street, road, footpath or waterway, owing to any alteration of alignment or level or any other work on the part of any public authority or person, the cost of the alteration or removal shall be borne by that local authority or person.
(2) (a) Where any telecommunication facility, pipe, tunnel or tube constructed by an operator passes over any private property and interferes with any building about to be erected on that property, the operator shall, on receiving satisfactory proof that a building is actually to be erected, cause the line to be deviated or altered in such manner as will remove all obstacles to building operations.
(b) Notice that any such deviation or alteration is required shall be given to the operator in writing not less than 28 days before the alteration or deviation is to be effected.
(3) If any deviation or alteration of a telecommunication facility, pipe, tunnel or tube constructed by an operator and passing over any private property is desired on any ground other than those contemplated in subsection (2), 28 days' notice thereof in writing shall be served on the operator, who shall decide whether or not the deviation or alteration is possible, necessary or expedient, and if the operator agrees to make the deviation or alteration,
the cost thereof shall be borne by the person at whose request the deviation or alteration is effected: Provided that in any case where in the opinion of the operator it is justified, the operator may bear the whole or any part of the said cost.
http://www.info.gov.za/acts/1996/a103-96.pdf