Apparently, Google has decided that its formal complaint system is "the Internet". We should all abide by Google's wishes and, as long as no internal complaint system appears, use the Internet as our complaint system, calling public attention to such problems so that Google will notice and do something about it.

If that happens enough, and each such complaint contains some reference to the fact that it only appeared on the Internet where Google can see it because Google doesn't provide a more satisfactory, direct line of communication, I suspect Google will eventually rectify that little oversight.