Wait for results, and compensate them for those results. If any ad sales person from a book review magazine promises you a book review in that magazine and then tries to sell you ad space, run away as fast as you can. If the salesperson is rude or obnoxious, hang up. Indeed, if anyone is ever rude or really abrupt with you, hang up. Even if they are a reviewer or talk show producer.
Life is too short.
You shouldn't have to deal with such treatment. You deserve better. Suspect any reviewer who sends you requests for review copies on poorly photocopied sheets. Suspect any advertising opportunity or reviewer who does not list a phone number. If a reviewer calls or writes for a review copy, you have every right to ask them more questions if you don't know who they are.