If  you signed the agreement, you could only cancel it:1) if the agreement itself contains some cancellation clause, term, or provision, and only if you follow whatever its requirements are; 2) it the advisor lied  to you in some way, or otherwise committed fraud  (made a knowing misrepresentation) to get you to sign; or3) if the advisor himself breaches (violates) the agreement in some material (significant or important) way.Otherwise, you would typically be held to the terms of whatever you signed.