The cache is not at the published co-ordinates. The published co-ordinates will take you to the grave of Kgosi Motshabi where you will need to answer the following questions:
What year did Mmakgabo relocate the location of Batawana Village? = ABCD
What year did Kgosi Motshabi die? = EFGH
How many lines in the main body of the English or the main Setswana text on the sign at Ground Zero? = J
How many legs hold up the sign at Ground Zero? = K
How many bolts hold the sign to its frame? = L
The cache is located at S18 H (B-1).(F-G) (J/2-E) (K+L-A) E024 (B/3) H.((Jx3/7)-(C+D)) (Gx3) E
Check Sum for South co-ordinates = 34
Check Sum for East co-ordinates = 19
i.e. add up the individual digits of your final calculated co-ordinates and they should match the Check Sum totals.
Happy Geocaching!