I found this in a previous post:
"Just got off the phone with a supervisor at their customer service number--(214) 792-4223. He assured me that it would be only 50.00 total to extend my credit. He told me more than once I would have 200.00 left over. I have 1 conf# for the 5 tix, so maybe that's why. He also said to call back starting Jan. 14th (since it expires Jan 13). He said you have up to 6 months after expiration to call!! And then they will extend it for another 6 months, so make sure you call at the appropriate time for you plans. He gave me a SR# (service request#) for when I call back. He said it takes 7-10 days to get the extension voucher in the mail, so keep that in mind."
I know there were other posts about this subject, but I can't find them now. I just was hoping it wasn't a case of it depends who you get on the phone. I was hoping to find the policy in writing on their website.