Have you got any WiFi extenders of any sort, they could be transmitting the old SSID. If not make sure the LED on the hub is green to indicate modem mode. Next thing to do is a full reset of the hub and start from scratch.
Tudor
There are 10 types of people: those who understand binary and those who don't and F people out of 10 who do not understand hexadecimal c1a2a285948293859940d9a49385a2