FNB VERY POOR SERVICE

Unauthorized purchase (R490) done in August 2018 , complained to bank the same day. FNB gave me forms to complete which I did the very same day. I have made numerous calls regarding this authorized purchase , then was put through the ***** department who then advised me to change my card details so that no further purchases can be done from the same company , I have changed my account details ,and after doing all of this I received a message on September 23rd stating that R490 is reserved for another purchase ... I called FNB complaints department on the 25th September again and was told to send through the reverse debit forms again.. that was done and when I called to follow up and told the agent that I cannot afford for that amount to go off my account again , I was told that there is nothing he could do to stop this purchase from going of my account ... Being a client of FNB I am utterly disgusted with their service.