Paid but never received...

I paid a traffic fine using FNB's phone application on the 28th of August 2018. Fast track to 2019 I received an enforcement order from the Johannesburg municipality ordering me to pay for the same fine with interest since its overdue. I tried calling FNB and explaining my situation but i get transferred from one department to another with no positive outcome. I tried sending the municipality my bank statement which reflects the payment and reference but the municipality wants the exact account number FNB deposited the money into or proof of payment which FNB cannot produce. Please help.