Duplicate transaction!!

On 01/02/2016 I have purchased pre paid electricity like I do every month via mobile app. The transaction duplicated. I phoned standard bank and spoke to a man by the name of tumelo. He referred me to another department where I spoke to Wayne. He told me I have to visit the municipality. Why did I use the mobile app??? Because I can't get to the municipality!!! It was a standard bank error because the transaction duplicated! I can't afford this financially! I can't get to the municipality! Why would I use the app if I could go to the municipality?? No assistance offered. This will be the reason for me closing my account with standard bank! And I haven't been a customer for a month or two and it's not the first time I use the app to buy electricity. They took my money in a split second but they can't refund me???