Please refund our son's savings money

FNB closed my son's account (*** )on 31 December 2017. I queried because much as the account was inactive, it had funds in it which was my son's savings. I have tried countless times to recover my son's money with no success. I have been to the branch numerous times and filled in dormant claims forms and have also emailed them myself but to date no response. I have correspondence stating the money was transferred to an account held at Green Model. FNB staff doesnt know this branch. The branch is required to debit their branch General Ledger account number *** (Claimed Dormant Balance) to reimburse the customer. i have submitted the necessary forms and FNB has failed to reimburse my son. we had opened accounts then fnb closed them. i finally opened an account again for my son last month and now want this money to be transferred to his account new account.