No,what happened is that you worked hard to up your fee and they agreed, but only in principle, and told you that you could perform the shop and then they went about finding another shopper to do it for the lower fee and suceeded, sothey came back to you and renaged on their offer in principle. Next time get work properly allocated with the agreed fee in writing before you rest easy. Some allocators will shaft you if you give them too much latitude based on over the phone chit chats.