Charge on account with with less than a months notice

I'm a private banking client with FNB and I get very little for it but as I had met certain conditions before at least I did not have to pay a monthly account fee for this account.

Last month on the 20th of August I was informed about a change to their account where they would no longer waiver my monthly account fee.

I immediately notified my private banker that had sent me this mail on the 20th of August and she was out of office (on the 20th of August? Actually my private banker has never not been out of office but whatever, this account was free before). I contacted the person that was included in her out of office detail and he told me that he didn't see a monthly account charge on my account - blah blah blah long story short on the 28th of August I was slapped with a monthly account fee of R399 without being contacted after I expressed concern over this.

There is NO WAY this account is worth R399 monthly and I'm very upset with how this was just pushed on me with less than a months notice, no further contact from anyone after I had expressed concern.