Is it useful to send a text message to reply to rejection?

It was useless to report in Chengdu Business Daily that the reporter made an unannounced visit to the SMS forwarding platform in the name of a merchant, and the answer was: "unsubscribe back to T", which is just a form. "even if the user replies to' t' hundreds of times, it is useless. Many SMS forwarding platforms have not written corresponding unsubscribe procedures, and the unsubscribe method "back to T" provided in SMS is just a show, which cannot cancel receiving sales SMS.