Is this really level of flailing emotion people bring to their customer service interactions?
"It's just super frustrating because we spend like $300/day!"
How about: "We have been spending $300/day, and an error on Google's part means we are not being provided the service we are paying for. We need to know that this is fixed and then will need to discuss our past spend with someone who can act on crediting our account. Here's how we can replicate the problem."
You aren't their buddy. You are not asking for a "solid." You are a business owner, not some tweener boy that smudged their new white kicks.
"you can also just search it now. it's still screwed up."
Own the facts and deliver them without emotional loading.
"Screwed up" is inaccurate and unprofessional - whiney in context with the "super frustrated" quip above.
"You can also just..." leaves room for a different set of facts.
Give a detailed description of the path you took and the results. If the results aren't obviously incorrect, define that issue. Repeat the desired outcome.
And, if you have "a meeting" and can't get the issue resolved, then you should have someone else make the call who can grind it out or schedule abundant time for dealing with this - or maybe $300/day and the previous spend isn't all that much and you should just walk away from AdWords...
You'd be better off penning blog articles that break down perfect grass types and pros/cons of various herbicides for the locality of McLean than crapping investor cash on advertising in the unseen margins of the search results.
Lawn care is definitely a word of mouth and signs in green yard growth business. I'd ask neighbors before trusting anyone who pays for AdWords, because my bill for lawn care pays for those AdWords and a good lawn care company doesn't need ads.
Most every service I've courted that does big ad spends on Google charges more for the same or worse service than other providers.