Select the VPN connection in the control center and select "Delete this VPN" at the bottom of the settings.

nope. doesnt exist

Ok, found a weird work-around for how you can access your VPN settings to be able to delete the connection.

I made a "fake" VPN connection for myvpn.isntreal.com and did nothing with it. Did not enter a password or anything. Without having received a password, you cannot move to the details page where the Delete VPN button is. So, whether the password works or not, whether the VPN works or not, simply put in a "password" and then click the  ">" symbol next to the VPN name. This will take you to the details page and you should then see the Delete VPN button.

Hope this helps!