Why did I text and chat with 186, and it didn't return?

I sent a text message to chat with 186, but it didn't reply:

1. 186 is a mobile customer service phone, not a chat object.

2, 186 is a system, only sending specific words or numbers will trigger the system to reply to short messages, and the content of the reply is generally fixed or generated for the account information of the information sender.

3. The 186 customer service hotline provides business services such as business consultation, business acceptance and complaint suggestions on mobile communication through manual, self-service voice and SMS.