Dim no As NativeObject
no.Initialize("NEHotspotConfigurationManager").runMethod("sharedManager", null).RunMethod("removeConfigurationForSSID:", Array("ssid here"))
Not clear whether it will disconnect an active connection.
removeConfigurationForSSID:
Removes a Wi-Fi configuration, identified by an SSID, that your app previously added.
Your app can use this method to delete a configuration that it has added, but not a configuration added by another app or by the user. The user can also delete configured networks through Settings > Wi-Fi.