Lenovo A60 sent a mass message, but some messages failed to be sent, and some messages need to be sent. How can I resend them?

Sending the failed SMS is because the other party no longer uses this number, and now this number is empty; The reason to send is that the mobile phone does not send all the short messages at once, but sends them one by one as usual, but you can specify multiple recipients at a time and complete them in turn; If there is a delay in sending, the message has been sent. However, because that person is off/off/out of service/network congestion and other reasons. I haven't received it yet, and I will receive it when the boot/network situation is good. Due to the network congestion caused by sending billions of short messages nationwide on New Year's Eve (8 billion last year), many people I sent at night did not receive them until noon the next day.