FNB is not safe

I have lodged a complaint against FNB and Iit compensated for an error that they caused,but I will still complain of about its incompetence as this involves money and I chose and Ave been with this bank for years because I believe my money is safe and secure with them I guess that is not the case.I have transactions that go off on my account and only report 24hours later worse the available balance on those transactions don't correspond to the amount that I would have in my bank account and this is what has caused declines for me in the past.I would like for the supervisor or manager to contact me and explain in detail to why this is happening and if there would be ***** going on how will I pick it up and if I should continue to bank with a bank that I feel cannot secure my money.Another thing I have gone into the bank to and on the App to update my details a year later my details still on some transactions initials the old details.I have no trust in my bank