i want my money back!!!

On Saturday i withdrew R3000 using my FNB card at another bank because FNB atm was not working. i got an error and money did not come out. just after that i got a notification saying R3000 withdrawn frm my acc and immidietly got a reversal sms.. to my suprise on Sunday while doing my groceries trying to withdraw money it declined due to insuficient funds and i waited for Monday to call of which i did and the consultant i spoke to did also see that there is a different amount between the balance and the available balance and said she sees it does not balancce and refered me to the authorisations dep and said there will be 2 ways either they will give me an autharisation form to fill or they will relies the money immidiately coz it is reflecting.. NOW no1 its my money and my kids are hungry debit orders are bouncing which is bad for my credit rating.. i will not wait to get my money back. i NEED that MONEY urgently! someone please look up to this. thanks...