CogentCo is not likely to be responsive or even acknowledging of a problem. You're not one of their customers, so they're really not even going to worry about talking to you and refer you back to your ISP. As far as talking to your ISP tech, the main rule is do not deal with the first 2 people you talk to. Generally those people are reading from scripts and have no real technical knowledge. Ask them to elevate you to tier 3, as was suggested before. These are the real tech support who actually understand what Latency, Traceroutes and the like are and what they mean.