Lying, Rude Call Centre- Transaction query

Called the ***with a query for a transaction that went through the company card without authorisation. I spoke to a lady called Barbara asking her for details for whoever debited our account as it wasn't authorised. She rudely told me this is a bank and she is not responsible for the supplier- when I asked a further question she told me I am ' high rated\ what ever that means. I then asked how I should report the matter as ***** and again she repeated that I am 'high rated'