moot, e-mailing Google isn't going to help you. The same people are just going to accuse you of bypassing Google entirely, or faking the e-mail, or any number of other things. Just start ignoring them, because it's a simple fact:

There is nothing wrong with 4chan's CAPTCHA service.

Just the other day I had one of those diehard "CAPTCHA IS 1 MILLION TIMES HARDER THAN IT WAS YESTERDAY" anons, and then once I told him he had to type a scan word of the approximate length it appeared, he suddenly noticed he was getting a lot more challenges right. I myself don't get any wrong and never have.

But some of them will never give up. You can't talk them out of their placebo effect.