To my knowledge there is no phone # to submit a new port request from PM. A ticket has to be made by a PM Agent. The Link should get you there to make a new request.
I think that if the 90 minute YES text is expired a new port request must be made:Here is the link the speak with a Public Mobile CS agent: https://productioncommunity.publicmobile.ca/t5/notes/composepage/note-to-user-id/22437