We regret that your failure to settle your account by October 7 th has left us with no alternative but to demand payment by return of post or institute legal proceedings in the event of default.

• 很感憾，贵方未能在10月7日前付清帐款，使我方没有选择余地，只能要求以回邮付款；如贵方违约我们只能提出法律诉讼。