FNB poor service

I have per (FNB call centre agent) delinked and tried to relink my cell to online banking as Authorisations were not working anymore. Upon trying to relink I only receive the email authorisation code not the SMS one. I called the helpdesk and logged a call. I was told that someone will call me back. I called the next day and was told that a specialist will call me back within an hour. This did not materialise, so I called again and was given the worst service ever from the call centre agent. She proceeded to tell me all the issues but did not try to assist me or even refer me to somebody that could. I am a business banking client and need these authorisations to work to make payments to suppliers and staff, yet FNB whose tag line is 'How can I help you' has gone out of its way not ensure that I am not assisted even though I explained the urgency of resolving my query.