How can i insert to database in opencart

Question

I need help I have to passed data controller to model but data is not inserting to database how can I do this . I passed post data twig view file to Ctrl and Ctrl to model(inserting is not happening), i have issue is opencart inserting logic.

below are the code:

Ctrl code:

if (($this->request->server['REQUEST_METHOD'] == 'POST')) {

            $data['name']  = $_POST["name"] . "</br>";
            $data['email']  = $_POST["email"] . "</br>";
            $data['phone']  = $_POST["phone"] . "</br>";
            $data['ref_num']  = $_POST["ref_num"] . "</br>";
            $name = $_POST["name"] . "</br>";
}

$this->load->model('account/reward');
$info = $this->model_account_reward->getRewards($data);

Model Code:

class ModelAccountReward extends Model {
    public function getRewards($data = array()) {

        //echo "model inside";die;

        $sql = $this->db->query("insert into ".DB_PREFIX."reward ('name','email','phone','ref_num') values('".$date."')");

        $query = $this->db->query($sql);

        return $query->rows;
}
}