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If you signed an agreement, you're legally obligated to fulfill those terms - when you sign a contract, you are affirming that you have read, understand and agree to all terms in the contract. Small print or not, you're obligated to what you signed.
However, the other party is obligated as well, and if they are not providing the service you were promised, you can cancel the contract based on their failure to orovide the service.
If you refuse to pay, even under a claim of inadequate service, you should expect to be sued. If this occurs, you can counter-sue on these grounds.