Hi Rashfact,
(What Symantec product and version do you have installed-? Is anything appearing in its logs?)
If you have not observed any odd behavior from your computer and nothing shows up in a scan, you are likely OK. These con men attempt to trick you into believing your computer is infected when it is not. (There are also cases where they sabotage the computer once they have control, and then refuse to fix it until they are paid.) Here are a couple of articles about how these scans work:
Technical Support Phone Scams
https://www-secure.symantec.com/connect/blogs/technical-support-phone-scams
When tech support scams meet Ransomlock
https://www-secure.symantec.com/connect/blogs/when-tech-support-scams-meet-ransomlock
If all is working OK and nothing shows up in AV scans, take measures to strengthen your defenses and treat the event as a learning experience.
The Day After: Necessary Steps after a Virus Outbreak
https://www-secure.symantec.com/connect/articles/day-after-necessary-steps-after-virus-outbreak
Please do update this thread with news! &: )
Many thanks,
Mick