FNB a ***** hub

Ive been banking with FNB as a private banker for more than a decade. I have however experienced the worst as Ive been subjected to ***** twice last year without FNB taking accountability or assisting me. The first instance was in April and nothing was done by FNB. This occurred again in December on the 5th, online transaction ***** to the value of R7500.00 occurred I reported this immediately when I saw these transactions. Typically of FNB I had to be the one chasing after them for feedback to be told that the investigation is closed and they couldn't find any wrong as the transaction required an OTP/in-contact to approve which is my point of query and concern as to how was it possible for someone to transact on my account without the transaction requiring approval. Im beyond gutted at the level of disrespect and lack of care FNB has show me.