unluckily, you don't tell us what country you're in. here in the states, it is definitely against the law to record a conversation without knowledge and consent of all parties. it is a federal offense( a crime in every state of the union), and not just that, i think it is also a felony (more than a year in prison). how do you like the picture so far? you need a lawyer asap.
if you have to consult with 10 lawyers before you decide on one. consultation either over the phone or in person is free of charge. if you already have a lawyer, then you must let him know of the recordings, before you get under oath and surprise everybody, including your lawyer, he must know every thing about your case.
good luck.