As others have mentioned, contacting a moderator will help but your issue may have been caused by your old service provider. It is also possible that there is a "porting protector" in action which would mean that you need to contact your service prov...
As always, try turning on and off your phone with your new sim, see if that clears up any issues. When it comes to the activation, I had an issue while activating my plan. Shutting down my browser as starting again worked. I also ended up waiting unt...