Any reply from a agent should be posted on the end of any enquiry: look http://support.giffgaff.com/app/account/questions/list
You have already done what you need to do - ie contact an agent. You can check for replies at support > messages from agents
Login and click 'support'. Click on 'Messages from agents'. You should get replies there.
I have taken a look at your account and can see the cases that you have rasied. I have brought this to the attention of the team and we will investigate this matter further.
I would greatly appreciate your patience
My number was ported yesterday too.
I did find that the dashboard took a lot longer to update to reflect the porting, than the actual physical number change.
I'm sure you've probably already checked, but just in case you haven't have you tried calling a friends mobile with your giffgaff sim to see what number is now associated with your sim?