worst customer service!!

I am never one to complain but FNB lakeside has just lost a customer!! Worst customer service ever!! On saturday 16 February i made a personal loan of R2000 ,which i have done many times before, somehow an error accured during the process and i received confirmation on monday 19/02 that my loan for R7000 has been approved. Straight away i phoned FNB lakeside explaining that it must have been a mistake and i explained to SALMINAH that i can not afford to pay the R879,00 installment back and that i only want to pay the installment for R2000. She then advised me to pay R5000 back imm and the installment amount will change within 5 days. The installment is still on R879 which is why i called them again to find out what is happening. The person i spoke to said, that will be the amount to be paid back on R7000 which i did not purposely loan. He advised me that she should have reversed the whole loan and should have told be to reapply!! I then spoke to her again asking her serveral times why she did not give me the right information in the first place and her response to me was "i can not tell you what to do??" I now have to pay that amount back due to the fact that she could not give me the right information in the 1st place! And then she says to me hello! When im busy talking to her!! When i asked them to put me through to a manager to complain about SALMINAH's attitude and her service i was told they are busy! I have been a loyal fnb customer for about 4 years now and this is the customer service they provide!! Disgusting!