DC issues can be fustrating, I get that. Since I do not work for Blizzard, can not see your tickets, and you have hidden your post history, I can’t see if you have posted in tech support, or provided any ping reports that might help seek out how your path to Blizzard/Activisions game servers.
Some of the basic information they have already provided can be used. Could it be a local issue, an ISP issue or something else? Unforatunately none of us can point anything in particular with out a look at past reports.
Disconnect codes can be rather generic, so just having those won’t get us anywhere.
As far as feedback to GM staff, you would want to leave that in the survey after completing the ticket.
Start here, unfortunately I think some of this info is dated, and you probably won’t get much in direct support via the forums. Mainly player to player.