Terrible service

I signed up with Virgin active through vitality and paid the activation fee. I then seen a promotion that the joining fee is free if you sign up in January. I have taken a screenshot of this promotion online. When I tried to call the call centre, none of the agents were aware of the promotion. I called other clubs who were however aware of the promotion. I also called vitality confirming that I qualify for the promotion. After numerous attempts and calling back and fourth, I am fed up and would like to know why the story changes on every call depending on the agent or club. Nobody seems to take responsibility, simply pushing you from one avenue to the next.