systemctl stop [servicename]
systemctl disable [servicename]
rm -rf /etc/systemd/system/[servicename]
rm -rf  /etc/systemd/system/[servicename] # and symlinks that might be related
rm -rf  /usr/lib/systemd/system/[servicename] 
rm  -rf /usr/lib/systemd/system/[servicename] # and symlinks that might be related
systemctl daemon-reload
systemctl reset-failed