unfortunately these are the joys and perils of running a business .We used to get bombarded with calls from the local emergency services and schools asking us to advertise in their local planner,diary,safety awareness sheet,etc.like you I only fell for it once.Your only "get out "might be to ask them to send you a copy of a current or previous edition.it may not happen !in which case you could argue that the services were not supplied as agreed?Just a thought.