Taking money without my consent

This morning R100 was taken from my account. Paid into some fnb trust. All without my consent and the wrong debit date. Now I am in a minus because of bad service from FNB once again. I was given a number to call with the name: Mariana muscat. The number was (011) ********** but it doesn't work. So what's the use!! I even tried calling my fnb branch. Their number changed, but the new one doesn't work. Very convenient!!!!! Fnb is supposed to look after clients.....!! Good work Fnb!!!