Gym Membership

I was wondering if anyone can help me. I signed up for Anytime Fitness and was assure I was recieving a discount as I have a blue light card. I have had difficulties cancelling my membership and have had to pay 2 more months. When putting through this payment I noticed there was no discount applied although I was assured on my initial call and when I first went to the gym I was on a discounted rate but it turns out I wasn't. I showed them my blue light card and was told I was on a discounted rate. Can I claim back the discount? It's not much but I feel very mislead. They have been extremely difficult when I have tried to cancel. I was wondering who should I contact about this. Many thanks in advance ☺️