Reversal payment dispute

I have a business account with FNB , on Monday I received an email from Samantha Smith, saying someone has requested a payment reversal in my acc. I responded to that email. Since then I never received any response from FNB, today Wednesday I decided to call the number on the email ***. I was on hold for 1:30 minutes then the it disconnected. Called again at 15:30 until I decided to terminate the call because it is clear there is no one working at FNB. Now I challenge fnb to withdraw money from my account & pay someone without my consent. I am definitely canceling that account. Will open another one somewhere. My money is not safe with u