***** case --- FNB refuse to recognise their fault

There was an unknown transaction done from my account, reported ***** but FNB advice none of the employees involved in the ***** and there was no failure of bank system. For God sake, how can you prove there was no bank system failure? The ***** line was always busy which I need to wait on average 30 minutes to get to speak to a consultant ( if your system is perfect then why so many people phoning the ***** line?) and money in my account just gone transacted without even a push notifications for approval.