Mikvehs in the Sandton area:
Sandton Mikveh
at the Sandton Shul
011 883 9706 or 083 718-0812
Mikveh Chana
Chabad of Sandton
082 440-3161
Chabad of Illovo
076 456-8471
To call from outside of South Africa, replace the 0 with your country outbound code and 27.