A page-one guarantee is an agency's promise to get your website onto the first page of Google by a date, or your money back. Google itself says no one can guarantee a ranking, because nobody outside Google controls the results. The guarantee survives on small print: which search, which page, which location and what counts as page one.
An SEO guarantee is usually met by ranking you for a search nobody makes, often your own business name, and then pointing at the contract. The refund clause is rarely the problem. The year you lost is.
