I can’t make any assurances about the feasibility of this, but investigate the possibility of making a small-claims filing for maximum damages in their jurisdiction (which may include your own) against/including a mid-to-high level Google executive personally. If the filing is successful, that individual can be compelled to attend, or risk a default judgement. You could receive several thousand dollars (which you could possibly ask the judge to apply to your “debt”), or more likely, force some higher-level attention be given to your issue. It could magically go away. If the claim is accepted and there is a default judgement, there could be press interest as well “See how one couple took on Google and won!” clickbait articles. You don’t need to hire a lawyer for small claims court, and judges and their staff overseeing the cases are often sympathetic to small claimants and can help with the process.
Edit: IANAL, but I’m related to several, and I read loweringthebar.com regularly :). Obviously, some research is required (I tried duckduckgo - Google searches were unhelpful), but I have a vague recollection of some precedents being established in the US about the right to have your data deleted, or allowing bulk downloads. I know there are laws in the EU that give you more rights. I wish I could be more helpful, but if you could get even a weak claim accepted, anything related to this, down to some weird local statute about being rude on the phone, you could get the attention you need to solve the actual problem.