Deleting VPN Configuration Files From Network System Preferences
To remove the VPN Profile from your Mac:
System Preference > Profile > Vpn One Click > Remove.
If you can't remove vpn in the System Preference, you can remove it like this:
open Terminal.app, run the command below to get vpn name
networksetup -listallnetworkservices
then run the command below to remove it
networksetup -removenetworkservice "vpnname"