Fido

I switched my phone from Postpaid to Prepaid awhile back, and I still have a negative credit balance on my previous Postpaid account. I thought it might get refunded automatically, but I keep receiving "final bills" indicating the credit balance. How...

I am considering changing from Postpaid to Prepaid but I have a few questions....   1) Can this be done at a Fido store or do I have to phone in?    2) How exactly is the $15 migration fee charged? Does it appear on my final Postpaid bill?    3) If I...