No resolution

FNB I have a query that has not been completely resolved since 20 July. I get pushed from pillar to post in the call centre. An agent is assigned to me and despite leaving 2 more messages for her I am yet to hear back. I have laid a compliant on the App, on Messenger, on Secure Chat, called the call centre and emailed. What else do I need to do to get a resolution to this? Perhaps contact the Banking or Consumer Ombudsman???