Wesbank refund

I settled my late son's wesbank account. A few days later I made a lump sum payment into the same account by mistake. I have sent a refund request to Wesbank. That money was meant to settle my deceased son home loan account account that is in arrears and payment is urgently needed on that account. Proof of payment has been sent to Wesbank two weeks and we have not received any feedback. I still have not received my funds