Fnb *****s money from Customers

I have been charged for unpaid items on my account from january 2018 uptil now ranging from R55 to R120 sometimes i have been charged twice in one month, i chatted to an agent over the secure chat function on the app to query these charges the agent i spoke to her name is Busiswe Cindy who informed me that the charges were triggered by my monthly account fees that went of the agent advised me that she will get the amount refunded for this month i then asked the agent what about all the other months i have been charged for the agent advised to collect the dates and chat to them again which i did, I then went back on the chat waited for an agent and to my surprise i got to speak to the same agent again who advised that unfortunately we only go back 3months so i told her to get so,e one to call me back has this is not a fault of mine and that fnb needs to refund me for all those months that i was charged i am still waiting for a response and i feel that this is ***** that fnb is commiting i wonder how many other people have been charged these fees for unpaid items