I heard it happens sometimes with intermediates for contractors too. A contractor friend gave the following advice.
Take a copy of your resume with you, the real one and go to your first meeting alone. Get them to talk about their stuff before handling your cv, act interested ask follow up questions and push on it. Then when it comes to your CV act surprised when they talk about stuff you didn't do. Tell them you have your cv as given to the intermediary and compare notes. Tell them you are disappointed with wasting their time but that the job looked really interesting. Most times the company is happy to find out their intermediary is shit and sometimes offers to take you on on trail basis.
Take a copy of your resume with you, the real one and go to your first meeting alone. Get them to talk about their stuff before handling your cv, act interested ask follow up questions and push on it. Then when it comes to your CV act surprised when they talk about stuff you didn't do. Tell them you have your cv as given to the intermediary and compare notes. Tell them you are disappointed with wasting their time but that the job looked really interesting. Most times the company is happy to find out their intermediary is shit and sometimes offers to take you on on trail basis.