I'm on Comporium Fiber to the Premise (EPON residential) and support several business customers who are on their dedicated fiber product (what you bought).
The voice service you bought is their VoIP product... out of region, not handled all by their own switches. The reason your port was so hairball was because they didn't actually handle the port themselves. Another carrier (either Verizon or Level3 most likely) handled it. For their VoIP product sold in areas where they don't control the CO, they use a third party carrier to provide your DIDs. Thus they have no direct control of the port. You had a pretty normal experience for their VoIP porting.
My only complaint is their peering isn't great. They get bandwidth from only 2 upstream providers (it used to be only one!) - Level3 and Spirit Telecom (who used to be InfoAve). Spirit's routes tend to suck often. On multiple occasions I've had to get Comporium's NOC to add static routes for certain internet peers so the traffic would avoid whatever crappy route Spirit was using. Thankfully as time has gone on, their edge routers have come to prefer Level3 routes more and more. But when Level3 route flaps, be on the lookout for dropped packet and weird things from Spirit.