I said Google doesn't have ads ON THEIR OWN SITES.
Actually, I just quoted the notice of their investigation, without checking. Since it was just another "don't click if you don't know" warning, I didn't really feel the need for a detailed analysis. It's an official notice of a possible pending or ongoing investigation of something undefined for purposes unknown - but it was interesting(?).
No business is going to send you an email to inform you of anything you "must do" to correct a problem.
They may post a notice on their own site. You do NOT use a link in an usoliceted email to go to their site. You use your own existing link, or you look them up to get a link from a trustworthy source.
They may include a notice with their regular snail-mail correspondence, as with a monthly billing statement.
They may rarely telephone to inform you of an emergency, but you should not give them personal information when they call you. You place your own call to their known service department, NOT USING a number given to you by "someone" who called you.
They may send you a snail-mail letter, in which case you call the service number you have on file, NOT one contained in a letter (that may be a fake) unless you have absolute assurance of the authenticity of the source of the letter.
You do not let "someone who looks like he/she might be from the 'phone company" (or any other business) in your house or on your property when they knock on your front door unless they are in uniform, wearing a known identification badge, and/or have and are willing to show you a photo-ID. In case of question, they can wait in their truck while you call the company they claim to represent and confirm that their representative is supposed to be there.