You can't. Oneplus 9pro Wireless charging does not charge Bluetooth headsets. Make a phone call to see if there is an indication that the service has been stopped. It may also be that the traffic in the package is used up, resulting in the suspension of the Internet function, or it may be that the traffic is used up to the limit.
Some mobile phones come with traffic monitoring software, such software can set traffic volume alerts, as well as the ability to automatically close the phone's data connection.