FNB still not resolved ***** committed against my account, they are grasping at straws

After the recent *****ulent transactions to my account, FNB is grasping at straw so it seems. Firstly they stated that the ***** was committed against my Virtual Card. I have two, they could not to date verify against which one. I also pointed out and asked how could this be done as the CVV number changes after each transaction. Yesterday they came up with a new theory, it seems. An OTP Push Notification has been done apparently from my cell phone to a Digital Wallet. Firstly I have not done this, as i steer away from things i do not know and i do not know how this works. Secondly FNB states that it was done from my Apple Device. I do not have an Apple Device and neither does anyone else in my household. So these transactions were never made by me. I just want this resolved and the funds returned to my account. I have been out of pocket since this occurred and the only thing recently that I have received from FNB is bad service and i have lost trust in my bank that I have been with for 28 years.