Usually, customers are told never to cancel an account when porting a phone number (because doing so prevents the phone number tranfser).
Saying that, I've had the exact same thing happen before when porting out from Wind. I ported out, the phone number fully transfered (to Rogers at the time), but the Wind service kept working. And, they had the nerve to keep billing me for another month, even after the port out. I actually talked to Wind about it after I knew for the sure that my phone number was fully ported just so there would be a record about the discussion, but because it was a number port that CSR didn't really want to touch it (in case of a screw up). I had to call back again when I got another month's charges on a bill. Because cancellation is supposed to take effect immediately upon a port out, they did refund the charges, but only after getting a supervisor to intervene.
Here's what I'll have to say. You will probably have to get Wind to cancel the old account manually. BUT, do this first. MAKE SURE your phone number has been 100% ported over to Public first. I'm not just talking about if incoming calls work, but rather what the porting department's databases states. Contact Public and make sure that they in fact have full 100% possesion of the phone number first. Then after you get that confirmation, get that same confirmation from Wind. These cell phone companies know who each phone number belongs to through that database (that's why customers don't even have to tell them which company a phone number is being ported from). Only then, and only after you make sure that database says Public/Telus now "owns" the phone number, get Wind to close out the account. Also, get them to reverse any plan charges up to that point because the account should have already been closed out.
