For whatever it's worth, here's how it looks to me:
* Y'all were using a Zyxel modem, which Sonic has provided at some times
* There's no alternate theory for where the Zyxel came from besides Sonic
* Sonic has not provided a convincing statement (e.g., a serial number) for why they think you had a Pace modem
Occam's Razor seems to suggest that Sonic messed up their records. I would urge the person sending the email to escalate (perhaps to somebody who can form grammatical structures) to review the issue, and forward that information to them. Explain that Sudo Room was a long time customer, and it would be reasonable for them to waive the fee if they cannot provide more convincing evidence that there ever was a Pace modem.
All that said, I happen to have a similar (not identical) Pace modem that I don't need. It's a Pace 3801, it's branded AT&T Uverse (not Sonic). It's a long shot, but if they will take that as a trade-in, I'd be happy to donate it to the cause.
-Pete
[[User:Peteforsyth]]