Dispute of money *******ly taken my account

Money was deducted from my account early October. I called FNB and they advised that I send a signed dispute form which I did on the 21 October. Today is the 17th of November and I still have not received my refund or a response from FNB. The only response I have received is their automated emails. What puzzles me is the fact that money was *******ly taken from my account but they have no care in the world. My details and clearly money is compromised but they do not seem to have any sense of urgency to try resolve or investigate. The snails pace slow rate of response is truly disturbing. I do not know what else is compromised on their watch - my savings maybe.