Laravel 5.3 DB:transaction is committing even some queries failed

I have a User model for basic user info, then a Role model and RoleUser model to associate roles with user. On user edit form, additional role can be added to that user. So, here two DB operations are done within a DB::transaction,

1) Update User info into User model
2) Add role to user

The issue is, if "Add role to user" fails, it doesn't Rollback changes in "User" model which already updated successfully.

Here is my sample code-

In Controller:

$response =
DB::transaction(function() use($user_data, $input) {
    //Update changes in basic user info using "User" Model
    $response = User::updateUser($user_data['user']);

    if ($response->status===FALSE) {//not updated
        return $response;
    }
    if (!empty($user_data['roles'])) {
        $roles = [];
        foreach ($user_data['roles'] as $role) {
            $roles[] = ['role_id' => $role, 'user_id' => $user_data['user']['id'], 'created_by' => $this->curr_user->id, 'updated_by' => $this->curr_user->id];
        }
    //Add new roles to the user using "RoleUser" Model
        $response3 = RoleUser::createRoleUser($roles);
        if ($response3->status===FALSE) {//failed to add
            return $response3;
        }                            
    }

    return $response;
}, 5);

//source of createRoleUser method in RoleUser model

try {
    DB::table($table)->where('id', $id)->update($changes);
} catch (\Illuminate\Database\QueryException $qe) {
    return (object) ['status' => FALSE, 'error' => $qe->errorInfo];
} catch (\Exception $e) {
    return (object) ['status' => FALSE, 'error' => [$e->getCode(), 'non-DB', $e->getMessage()]];
}
return (object) ['status' => TRUE, 'data' => $changes + ['id' => $id]];

//source of createRoleUser method in RoleUser model

try {
    $new_rec_id = DB::table('role_users)->insertGetId($new_data);
    $new_rec = FALSE;
    if ($new_rec_id) {
        $new_rec = DB::table($table)->where('id', $new_rec_id)->first();
    }
} catch (\Illuminate\Database\QueryException $qe) {
    return (object) ['status' => FALSE, 'error' => $qe->errorInfo];
} catch (\Exception $e) {
    return (object) ['status' => FALSE, 'error' => [$e->getCode(), 'non-DB', $e->getMessage()]];
}
return (object) ['status' => TRUE, 'data' => $new_rec];

via Chebli Mohamed