How impossible was it to leave? Where the doors locked or blocked in any way?
Also check the package offered if the prices are competitive or inflated? What record does this company have with the BBB that state's Attorney General?
Since it has been a year or so getting out of the contract would be difficult unless they did something REALLY underhanded. In any event insist in writing (registered letter) you want to cancel the membership (but make sure there is no outrafeous termination fee). If this company has any licenses from the State attack the company through the licensing agencies.
This is only general advice it is highly recommended to contact an attorney in your area for definitive guidance.
I'm only licensed in CA. Please note that this answer does not constitute legal advice, and should not be relied on, since each state has different laws, each situation is fact specific, and it is impossible to evaluate a legal problem without a comprehensive consultation and review of all the facts and documents at issue. This answer does not create an attorney-client relationship.