Hate to say it... but it may be time to shop around if you can. Perhaps the threat of loosing a customer will put a fire under their butts. There are other ISP's that lease lines from the locally installed ISP's. Not sure who is providing coverage in your area though. Earthlink may be an option. They lease access from TWC here. They even bill through TWC's system as well--the funny thing is it is $3 cheaper. Go figure. Only reason I'm still with TWC for at least one more year is that when they tried to jack my rates, I told them I was switching and they dropped me to $1 under Earthlink's promo rate for the next 12 months. heheh.
CenturyLink or Exede may be viable candidates as well. IDK... could try plugging your zipcode into something like this site to get a list of companies:
http://internetprovidersbyzip.com/in...iders-zip-code
All I can say is my TWC changes my route regularly. At first, I had to contact Tier3 directly about it (providing trace logs, signal pages and event logs from my modem and such)... but lately they've been catching it just as the congestion starts getting nasty. Once my latency starts breaching the 200ms mark coming through the north east (typically around the Ashburn/DC or NY/NJ areas), the route gets flipped in the next day or so without me having to even shoot them an email on the matter. On average, it's about 2-3 weeks between updates. I've gone from Tata, to Cogent, to Level3, and back to Tata again since Valentines day weekend. My gateway has remained the same throughout all of that too (in the past, they also switched me to another area in the process--so I've appeared to be moving all over the state if you were to look at my geolocations).
Don't know the dirty details of just how it is done... but it is done quite often in the business. Maybe it's because you aren't talking to the right people. But we've seen them do this kind of thing quite regularly for people. One thing for certain though is that it has always required getting Tier3 involved to investigate the route (why the tracert helps so much--gives them the roadmap), and then they call for the needed escalation to get it addressed. Maybe you need to request a superviser or higher level technician or something. SOMEONE in that organization is responsible for assigning the metirc that is picking specifically GTT's service to get you to Ormuco. Whether that decision is based on BGP data or something else--there is a system for making that prediction/assumption, and there should be a means to either influence the outcome or outright override it somehow. The trick is getting in touch with someone who knows what is what.