Number ports are best done through the new provider, not the old provider. The account at the old provider is automatically terminated (forever) when the new provider takes possession of the number.
The old provider doesn't even need to be informed. Indeed, if they get involved, it'll likely delay or disrupt the porting process. The Wireless Code is actually set up to favour and protect consumers instead of providers in this detail.
All that being said ... the account at the old/existing provider has to be in good standing and the number has to be active. Sadly, this means you'll have to "waste" some money paying for days of service which won't get used, if you want the number port to succeed then you can't allow your account to lapse into suspended/inactive status due to lack of payment.
Public Mobile does not issue refunds, returns, balance transfers, pro-rated credit for unused portions of billing cycles, etc. It is exactly the same as all the other Canadian prepaid operators in this regard.
