Registerfly has responded to my last support ticket:

Response:
Dear client,

Please be advised , this domain appears to be in redemption.
This occurs when a domain has surpassed the 29 day grace period,offered for renewing an expired domain name.
Redemption can be anywhere from 60 days to 9 months.
To remove a domain out of redemption, you have the option of placing a fee of 209.00 into your account, submitting a support ticket , requesting that the domain be released from redemption status.
As this domain appears to be held by one our previous backend providers enom. you may also contact enom.com to see what other options are availble for this domain.
The amount of the renewal attempt has been issued to your quick checkout account.

This, after telling me to keep trying to renew and it should work out. Some people have accused Registerfly of holding domains hostage to extort its customers. I'm starting to think they are right.

I've send yet another support request, this time letting them know that I would rather communicate with them in writing over fax. I might have to talk to an attorney about this.