How can I delete default route in routing table on windows 2012 created by FortiClient?

I have NICs 4 Ports on a server when I connected to my VPN all packages through on tunnel created by Forticlient. Next, I try to delete default routing created by Forticlient such as 0.0.0.0 0.0.0.0 vpn_gateway_ip in Windows 2012 but cannot delete it when I delete it Forticlient created it again and again. What Next I do ?