Incorrect billing and refusing to refund me

FNB is charging me for a credit card services that I do not have and did not ask for. and even worst yesterday I was contacted by someone by the name of Brenda Alexandra her number is *** reporting to Mr Sing. Brenda knows nothing about customer service she did not want to listen to what I was saying she was going on the whole time, that's RUDE! even worst she was telling me that I was being charge for everything, For buying airtime on the app or via cell phone and I am being charge for all the transactions but I am already on the premier account which is supposed to be R199 when I took it but ever since I have been paying over R300 every month and she says FNB doesn't owe me anything and the lady who logged this complaint told me I was being billed incorrectly and I was upgraded to the wrong package. But Brenda doesn't know what she is doing, Hence I will be taking this up with my Lawyer. FNB has been billing me for something I did not ask for. ***NF and ***NF I want this to be resolved by today and I don't need anyone to call be before listening to Brenda's call and I want someone senior to call me so that I can teach them a thing or 2 about customer service.