I just set up a telecom calling card at school and called to say that I have set up campus broadband.

If you just set up a telecom calling card at school, but didn't choose to open campus broadband service, I will call you to say that you have set up campus broadband service, which may be a misunderstanding or fraudulent phone call.

I suggest you confirm whether the campus broadband service is really opened first. You can contact telecom customer service or go to the network center of the school for consultation. If it is determined that the service has not been opened, you can hang up the phone or report the situation to the telecom customer service to avoid bringing unnecessary security risks to personal information and property.