System error cause double payment to 3rd party

I paid a third party on 19 April 2016 once. When I saw again it was taken off my account twice. When I checked the beneficiary logs, it went through twice. I was told I paid it twice, 20 minutes apart. The system (internet banking) states it was done at the same moment and second. Definitely a system error.<br> <br> ABSA didn't block or stop the second payment when asked. They ignored it. Now I have to wait 2-3 weeks for my refund due to their system error. Not good service. <br> <br> As a Private Bank Client, this is ridiculous and this incident would make anyone nervous to transact online. Need to be compensated for their system error and my refund should include interest.