FNB HOW CAN WE NOT HELP YOU!!!

i'm trying to close my FNB PLATINUM CHEQUE ACCOUNT due poor service levels was promised things and FNB DID NOT DELIVER!!!!. i'm now sitting with a situation here. yesterday i was told by the premier bankers that i must withdraw the remainder of the money in my account and thats what i did.After drawing the remainder of my money out of my account this morning i get an email to say that i'm in a negative i need to transfer the money back. i have also R2 oustanding authourisation with the apple store and have sent fnb an email that i got from apple support and i'm still waiting for their response. now i have also noticed after they had told me to withdraw the remainder of my money i was hit with a service which has caused me to go into the negative. i want my account closed immediately and i WILL NOT TRANSFER THAT MONEY BACK INTO THE ACCOUNT ITS NOT MY PROBLEM!!!