Money dissappearing from my account

Last weekend my husband picked up that between two transactions on my credit card about R800 went missing. We reported and they promised to get back to us on Monday to see what happens if the account refreshes overnight as the agent also picked up the missing amount. Heard nothing from them. Logged a complaint wit a request for urgent feedback via internet banking and guess what???? No response. I am now very worried with Fnb being in the news lately apparrenly about money matters of the like. I find no feedback on urgent issues like this very cumbersome and unacceptable! And FNB unfortu ately once again leave me no choice but to go public with this. Also the last two day my online.and cellphone banking is going crazy. The day before yesterday my cellphone app for the life of me did not want to accept my password which I know by heart! But if i go to online.banking on my laptop its all fine. Till yesterday the shop did not accept my business account pin nr and also when I got home even the online banking did not want to accept my password. I changed the password and guess what??? This morning the app keeps on saying I have the wrong.password! All this is very worrying