I was contacted by a soundman to who desired to run sound for my band. He agreed to 5 dates through email. A couple months later he handed the bookings over to his brother who was represented as another sound company. I didn't know him and didn't desire to use him. I cancelled the bookings. There was no cancellation clauses discussed. I had actually cancelled the first of the 5 bookings 2 months before due to our show being cancelled. At that time he did not seek any payment. Now he is claiming rights to the money for all 5 bookings. Can the agreement be cancelled due to the fact that 1) we were not notified of the change of companies performing the agreement, and 2) there is no signed contract outlining any cancellation stipulations?