Port phone number from vonage to xfinity

I'm trying to add a phone number to my comcast account by port a phone number from Vonage to Xfinity and Xfinity is saying that Vonage won't let me, but Vonage says the minute they receive a request they will release it.

I received this number from Xfinity originally some six or seven years ago.  

Help.  My 30 day trial for vonage runs out in about 4 days then I'm stuck.