Disable BT Wi-fi on Plusnet using HomeHub 5

[#1]

Hi,
I have a BT Home Hub 5 connected to plusnet but its still broadcasting the BT Wifi (formally FON) network despite loggin in with a Plusnet account.
I have tried the factory reset which works fine for a couple of minutes displaying an "activate" next to BT wifi but then within a few minutes its "activated" automatically which no option to disable?
Does anyone have a solution?
Thanks,
EDIT
Just in case anyone else has this problem, under Advanced Settings click, Broadband, BT Wifi and there is an option to disable. It may take 24 hours,

[#2]

I have a HH5 and plusnet went live yesterday but i dont have the bt wifi option as you described when i select advanced , broadband ?
any idea how i turn off btfon ?