Complaint about lack of service Standard Bank

Once again I have let down by shoddy service from Standard Bank. They made an error in payment to City of C.Towm.Every month I pay CofCT via my beneficiaries and this is debited to my Cheque account.However my May payment was charged to my Credit card. Heaven knows why. Not only was this THEIR mistake I have now been charged a transfer fee.Over the last 12 days, I have sent 7 E--Mails to then without any success or even an acknowledgement. Try phoning is a complete waste of time. I think the public should be made aware of the LACK of service received from them.I am at my waits end trying to get this sorted out. Can you help