Fnb monthly & service fees deducted twice off account

Good day Fnb

I noticed on my cheque account that I paid my month fee and the other service fees on the 16Mar18 as per normal however I see on the 01Apr18 I have been charged monthly fees and services fees again which seems to be an error from Fnb side as I should only pay my monthly fee and service fee on the 16thApr17 please clarify and clear up this issue immediately as I'm not very impressed by Fnb taking my money that they are not rightfully entitled too.

We as clients entrust our money to you to look after in your bank and we inturn pay for this and to make errors like this makes one question how safe is our money placed in the hands of FNB?

I trust you will resolve this issue promptly.

Thank you John