Sphingidae, Agrius convolvuli, a pest in RSA, mostly in the specially part.
http://www.wildlifeinsight.com/Insight/?p=6462
Perfect match for yours!
http://www.wildlifeinsight.com/Insight/wp-content/gallery/gb_caterpillars/1972_convolvulus_hawk-moth_caterpillar_2763.jpg
http://www.biodiversityexplorer.org/lepidoptera/sphingidae/agrius_convolvuli.htm
http://commons.wikimedia.org/wiki/File:Agrius_convolvuli_korseby.jpeg
http://www.aphotofauna.com/moth_agrius_convolvuli_convolvulus_hawk.html
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