Rollback previous deleted rows if any failure occurs in laravel

i want to delete all records in this and if any table value is not deleted i want to roll back all previous deleted rows in this.Here is my code

 DB::beginTransaction();
    try {
        $customers = Customer::findOrFail($id);
        $customers->delete();
        $user = User::where('name','=',$customers->user_id)->first();
        $user->delete();
        DB::commit();
    } catch (\Exception $ex) {
        DB::rollback();
        return response()->json(['error' => $ex->getMessage()], 500);
    }

in this if customers got deleted and while deleting user if any problem occurs i want to rollback the previously deleted customers data.But here its not working.The customers data is deleting and not restoring it

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