Who should I send the refund information of two tickets to?

If you refund your ticket online, you will receive the refund information of 12306. If you go to the railway station to refund your ticket, the ticket office at the station will type out the ticket and then refund it, which is equivalent to picking up the ticket first and then refunding it. As long as the ticket has been taken out, 12306 will not send any more text messages.

But your mobile phone will receive a refund message from the bank where the bank card was purchased within 20 working days.