Inaccessible communication systems

Sanlam's has a WhatsApp line that is not a joy to use. I have been made to wait for a "human consultant" forever, only for the system to close due to "client inactivity", my fault. Also, the WhatsApp line claims that there are no consultants because "it is after hours", even during the week and well within working hours. I tried to use the customer line, and I was made to wait for more than 20 minutes with nobody picking up the phone. This is bad service even by entry-level standards. As a clients, how should I contact a company that is looking after my funds?