Below method for uninstall client
You can use sepprep utility
Uninstall third-party security software using SEPprep
https://support.symantec.com/en_US/article.TECH148513.html
You may want to try SEPprep utility. Its a competitive product uninstall tool. But it can also be configured to uninstall SEP Client by modifying the following line in the SEPprep.ini file.
RemoveSymantec=Y
Uninstall Symantec Endpoint Protection
https://support.symantec.com/en_US/article.TECH184988.html