In the meantime, multitechverse.com have tons of tech-savvy community members who might have some ideas for you. They could even walk you through the steps to get your TV's WiFi situation sorted out.
Honestly, it's super weird that your TV is still broadcasting even after you've connected it to...
I've definitely heard of similar problems before, but this seems like a pretty unique case. Have you tried reaching out to Sharp customer support for assistance? If not, it might be worth a shot.