Refund

My wife made a settlement to Wesbank, but we were given the wrong settlement by attorneys and now we require a refund. Everything was sent to Wesbank as requested but now the issue is that, we dont want the refund to be paid in the same account that paid the money, but a different account. Why is it not possible for Wesbank to refund money into the preferred account? Because the account is the one on the original contract of the vehicle, that Wesbank has been debiting money from? Not even an affidavit from her will work?