FNB *****ulent transaction and impossible to get a response

Received an SMS notification late on Saturday night that a large amount had just been purchased on Facebook using my business debit card. This card never leaves my possession and is never physically used as I have phone payments set up. Immediately went to the banking app to report and cancel it. Their ***** line didn't work, the link to report ***** gave an error message, and when I eventually spoke to a person they couldn't hear me because the voice function on the app is broken. After some time managed to cancel the card, order a new one and establish a ***** case. Got no response, confirmation or communication from the bank whatsoever. Next day went to the bank website where they have a form to report *****ulent transactions - completed it and sent it to the address given ON THE FORM, and email was rejected and returned as undeliverable. Phoned the bank again to confirm that the case had in fact been reported. No new card had been ordered and they were extremely unconcerned about the *****, telling me 'Sorry we can't reverse it, the money has left your account' and telling me it would take 7 to 30 working days to investigate. - I have never seen such incompetence in my life. At this time I still have received no written response at all from the bank. Lost all faith in the security of my bank account.