FNB

I am very disappointed ???? with FNB,in the month of May I went to purchase something by the butchery shop and I swiped my card as I had money and immediately it went through the transaction,on the 12 of July 2019 I received a notification stating that I did not pay the meat that I bought in May how I don't know but money was taken from my account,this month end because of that my account was in arrears of R1000 and it was taken immediately when I got paid,I logged a complain with ReferenceRl*** and I was told the account investigative team will respond to me with 3 working days BUT NOTHING has happened,I was ****** my money by FNB and they don't know what to say,I am so disappointed thinking that they are a big institution but I guess I was wrong.