Aah, thank you for the insight. I killed off my devices' networks but alas I still saw the pesky SSID's. Finally figured out it was my RE200 Range Extender ...I'd forgotten about it. It still had the...

Replaced TL-WDR4300 N750 dual band router with AC 1750 Archer C7. Setup went fine with a new SSID for new router. However my wireless devices show the old router's 2.4 GHz and 5 GHz SSID's are still...