Incorrect debit order date on my bond account

Am really unhappy with the service I've been receiving from FNB home loan Last month I requested that my debit order change to the 15th instead Natasha Khan who is one of your consultant changed the debit order date to the 25th not sure if she pays me on that date She advised that I make eft payment on the 15th towards bond which I did but still debited my account on the 25th. Why I don't know. I've been calling FNB from last week but was never assisted no email or call back last time a supervisor named Miriam Pitso promised To give me feedback still waiting to date.is that how you treat your customers fairly ? My credit score is messed up because of your consultant stupid mistake of which they don't want to account for ?