Net gear tech service wanted $110 to renew some security feature in my 3110 Wi-Fi extender

I was setting up a new printer. I got a warning about a Wi-Fi network that was unsafe. I had never seen it before. Then I could not log into my accounts with Westlaw, several newspapers and other sites. I could get on YouTube. I scanned for malware, equipment failure but nothing changed. I did a factory reset of my laptop. No change. I called Netgear support and was told that a subscription to an internet security feature had expired and that is why I couldn’t get on sites that I need. The person on the phone offered me a 1 year, 2 year or lifetime subscription starting at $110. He said the router would continue blocking sites that it suspected were unsafe. I declined and now am looking for help to fix this. I have “forgotten” the Wi-Fi network under the Netgear extender but still can’t get to the websites I need for my work.