Thank you, but I and pretty much everybody at the company has given up months ago. We've tried everything we could (well, I guess we should've tried to go viral on HN or twitter...) and it got ignored again and again.
It has become a bit of a rite of passage when somebody new arrives, they see the error ticket for the first time and are eager to dig into it and solve a long standing problem. It's like a trust fall, only the lesson is not to trust, and you learn that lesson by falling.
https://support.google.com/google-ads/contact/aw_complaint