How do I get I an answer

Hello<br> I have been trying to contact Telkom in order to upgrade my LTE package from 20GIG to 50 GIG or 100GIG for several days. It is impossible to get an answer on the phone. I tried calling 081180. They tell me to phone 10213. Unfortunately, there is no answer here - no matter how long I hold on. I need to know what this will cost. I want it on a month to month basis.<br> PLEASE can someone help me? Or tell me where to call where I will get an answer on the phone.