How do I Report a Faulty Node/Server Causing Excessive Packet Loss?

Apologies in advance if my terminology is off as I'm not a programmer or engineer, but for the past 6 months, I have had bizarre and very noticeable lag that didn't appear in common entry level diagnostic tests. Eventually, after reporting the issue to several game developers, one suggested that I use a program called PingPlotter to record where my data is being routed. I don't want to waste time recording information for all my web traffic, but I have noticed my data being run through a server called twelve99.net. This single server (company?) appears to be the root cause of the problem. If you Google them, you will find tons of user complaints, mostly from other gamers, who I suspect are inherently more likely to notice such packet loss as it manifests in gameplay very obviously (rubberbanding, freezing/skipping in place for 10-15 seconds, etc.) The developers I talked to said I would need to report the issue to my ISP, but from everything I've checked, there isn't a formal or official manner to actually do this. I'm not even sure what remedial options there are. Can this server be removed from the route? Can the underlying issue causing packet loss be resolved?

In the interim, I have partially alleviated the issue by using a VPN that does not route through this server.

I don't see an attach file or insert image option here, but I recorded two separate sessions in PingPlotter and I am happy to provide the data.