You might not be able to get out of the contract. If you can show that the telemarketer committed fraud in some way--for example, that he lied about the cost, subcription length, ability to cancel, the magazine(s) you'd be getting, etc.--then you would have good grounds to get out of the contract. However, if he did not lie, and the only problem is that you did not understand him, that it not a basis for cancelling a contract; it is the buyer's responsibility to make sure that he or she understands the deal--knows the terms, the cost, any kickers, etc. It is the buyer's duty, if there is any confusion or ambiguity to either ask questions to clear it up--or to refuse to do the deal. So if you think that the recording and any other evidence will show fraud or misrepresentation, that is one thing; but if you think it will show what the company says it does, and that you simply did not understand it, you probably will not be able to get out of the contract.