How to kill the PID of service that configured as Restart=always

Dear friends and colleges , We have service under /etc/systemd/system Service name is calc_live_servers.service Since Restart=always is configured in calc_live_servers.service Then when we kill the PID of the process or kill -9 , then service is restarted again and will be up is it possible to kill the PID so service will not start again after we kill it in spite Restart=always? The service calc_live_servers.service [Unit] Description=calc_servers Server Requires=network.target remote-fs.target After=network.target remote-fs.target [Service] LimitMEMLOCK=infinity LimitNOFILE=65535 Type=simple User=CAS Group=CAS ExecStart=/usr/bin/calc_servers-start /etc/calc_servers/calc_servers.properties ExecStop=/usr/bin/calc_servers-stop Restart=always [Install] WantedBy=multi-user.target **Main target - is to stop the service by kill the PID without use systemctl stop and that because sometimes stopping the service not really stop it**