We recently "lost" a business number during porting. We had a consecutive block of 400 numbers, but a single number was mysteriously ported to a company called

We recently "lost" a business number during porting. We had a consecutive block of 400 numbers, but a single number was mysteriously ported to a company called "Neutral Tandem" instead of to our new carrier. Baffling. Nobody from our new or old carrier has any relationship with them, nor could they do figure out how that happened. Nobody from either carrier could get the number back after several weeks of effort. When contacting Neutral Tandem we got a "You're not our customer, and we have no records of you owning that number. So we can't tell you what happened or how to fix it, sorry." So the number is effectively gone, and I am experiencing neat-nick anguish from having a single hole in our beautiful list of 400 consecutive numbers (which have been used at our company for more than 40 years). Anyone from Neutral Tandem (now called Inteliquent I think) here on HN and willing to help?