however I DOUBT Google will let you use the term "guaranteed" or even similar when the word "Google" is used in the creative.
doing a search for SEO brings up many companies offering guarantees, but I could NOT find specific terms related to Google.
Obviously NO 1 can guarantee this facility, and I am sure Google will be keen to enforce that message, rather than make a few $$$s out of it.
just my 2 rupees.
Shak