Disappointing Virgin active

I have been recently disappointed by Virgin active and their view on the cancellation of my contract. I had joined Virgin active this year based on a friends recommendation we both sat at the contract explanation and it was not explained that there was such a high cancellation fee should I want to cancel. I recently acquired a medical condition and Virgin active want a high cancellation fee regardless. When initially my entire contract wasn't costing me this price because I have a Greenlight policy that reimburses me. It is forever a regret I joined and I would not recommend Virgin active because of this.