Can't remove locked VPN Connections installed by HotSpot Shield

How can I remove locked VPN connections under Network? (OS 10.9.5)

HotSpot Shield installed three VPN connections under Network settings. I no longer subscribe to the service and have removed the application, but I'm unable to remove the network connections.

Three VPN connections were created:

"US Server" utahmaps.us

"GB Server" jacketmagazine.us

"JP Server" brainphotos.us

However, all these connections have the padlocked icon beside them, and I don't have the permissions to delete them.

I'm including a screen capture of one of the settings, for reference.

I can set them to inactive, but would like to remove them altogether.

Can anyone offer any assistance?

Thanks