Hey,
From the screen shots you posted, I see three different signals, TelKom LTE, TelKom 3G and MTN-SA 3G. A couple of questions since I do not know the carriers in South Africa.
1. Are you roaming if you are on one of the carriers? Roaming has an affect on my battery since it is looking for native service.
2. How much time are you on 3G versus LTE? If I am on 3G with Sprint, my phone battery depletes much more quickly than on LTE.