fix logic and tests, update docker CI file

app/Services/Administrator/AdministratorEnrollmentRefundService.php

@@ -4,7 +4,7 @@ namespace App\Services\Administrator;
 
 use App\Models\Enrollment;
 use App\Models\Invoice;
-use App\Models\RefundModel as Refund;
+use App\Models\Refund;
 use App\Services\FeeCalculationService;
 
 class AdministratorEnrollmentRefundService
@@ -73,4 +73,4 @@ class AdministratorEnrollmentRefundService
             'refundAmountByParent' => $refundAmountByParent,
         ];
     }
-}
+}