Mobile plan upgrade query

[#1]

I'd like to upgrade my Mobile plan to one advertised on the Plusnet website.

£8 per month for 20GB data
Rolling 30 day contract
Unlimited texts
Unlimited minutes

However when I'm logged it confirms my broadband account but doesn't acknowledge that I'm already a Plusnet Mobile customer and is asking to transfer me into the Plusnet network from another provider. Is this correct, are current Plusnet Mobile customers eligible for the Yorkshire Day offer?

[#2]

I can arrange that for you. I've private messaged you about something else you've messaged me about so when you get back to me, I'll change your plan to the above offer  

[#3]

I've just replied to your message, thanks.

[#4]

I've PM'd you back