Yeah man, I have the same problem. A few of us on here have the same one, but not a lot. If you scroll through the forum there is another thread about it, but there was no solution. I tried getting on the phone with virgin mobile 4 or 5 separate times and they can't figure it out either. It is a problem with their network though, not your phone. They had a phone that their tech was using and activated it with my phone # and stuff and they got the same notification on their phone.
The only thing you can really do on most of these roms is disable the notification in the status bar. It will still show up on the pull down notifications and on the lockscreen if you have it set up for that. A few roms you can actually disable the notification from the phone.apk but most of them it is checked and greyed out so you can't turn them off. I think it was vanir you can disable it. I just updated to LS 4.4.3 from vanir 4.4.2 and I'm pretty sure that was the one that you could disable it. It was either that or pacrom.