If you signed a contract, then you can be held to it even if a signed copy was never returned to you--there is no legal obligation or requirement that you get back a signed copy before it can be enforced against you. If you violate the contract, then you could be sued for any provable losses (including lost profit) or costs you caused the other party to incur. You cannot get out of a contract with 2 months notice, unless and only if the contract itself stated, by its very terms, that you could terminate the contract early with sufficient notice; but if the contract does not provide that, then it doesn't matter how much notice you give--you are still obligated. Based on what you write, you appear to be obligated to the contract and could potentially be sued if you breach it.