I am sorry you had to experience that.
However, it is not a good idea to offer a discount on the session for a review if the review is promised to be posted after the session takes place. Instead, offer the discount for a future session.
Originally Posted by Mokoa
I agree with Mokoa. If you absolutely must offer a special, you should always always apply the discount for the NEXT session after the review has been written. If they don't like it tough shit. Ignore them and move on. Many guys take advantage of these specials with absolutely no intention of giving a review. They are using you for the discounted prices only. At least if the next guy still doesn't write a review, he paid full price for his initial session.
ADDITION: just read the entire thread. Welp my opinion is a day late and a dollar short I see with all this bickering going on...