How do you stop an advertiser from making false claims?

There is a classified ad for US income tax preparation from jkrebs that claims to be recommended by the US embassy. Yet the loist he refers to says

"The following individuals/companies in Bangkok have indicated that they can provide

tax consulting services and assist in the preparation of income tax returns for U.S.

taxpayers

in Thailand. The list is not exhaustive nor its inclusion meant to be an

indication of U.S. Embassy endorsement for the quality of services available."

That hardly seems like a recommendation!

Could you please let me know the URL for the ad?

Cheers