Awaiting Constructive Feedback

I made a double payment via my banking app as the first transaction failed (I received a notification on the app in red stating that the transaction failed). Upon making the second payment, I realized that my account had processed both payments. I immediately contacted Discovery Bank and the agent acknowledged the mistake. Four calls later and I am still waiting for feedback. Reference Numbers / Dates of Calls: ***5 - 30/***- 01/***- 03/***- 08/02