Dedbank not Nedbank

I had a personal loan from Nedbank. On the 23rd June 2021, i went to the branch to settle my loan. I was advised to use the app and forward the proof to ***. I was owing +- R1800. I made the payment & sent the email. I got no confirmation from Nedbank. Further to that, the same week, a debit order for the same amount went off. I sent an email on the 25th June to advise what happened and I haven't received any confirmation.