Ecom Express — Refund of money

In my recent delivery, i want to pay the money through online and i tried to pay the payment and its shows processing ..it was taking long time to get paid i dont know what the problem is something server down has happened but it was showing processing but i paid the delivery agent cash directly but after some times later. A message was initiated by bank that amount for that parcel which was processing is deducted from my bank and i want full refund for my money