I have a ticket in with Google. So far they have tried their best not to help me, but then they escalated to a higher support team. That was a few days ago and I am waiting. To contact them, just go to the help link at the top when you are in Google Ads.
Shopify has persistently refused to help at all. They just tell me to hire someone or buy an app. That’s a ridiculous solution, knowing they are the ones who broke this. I now have no Google reviews coming in and from the research I have done, no pop-ups will work with the new post-purchase page, so there is essentially no solution for this. If I am given a big enough refund to pay for an app, I will move on and be happy, but refunding anything is something Shopify will never do unless forced to by a class-action lawsuit. That is actually what needs to happen.