Ylg India — Money blocked in ylg account

I subscribed for their beauty secret card last year. They said you load the money in the card and use it whenever you need to pay for service. Taking the card means getting various benefits like discounted price. They clearly said that when not in use you can block the card and the validity will be extended by the number of days you have blocked the card.

Now, I am trying to temporarily block the card but no one is responding. There is no reply to emails to customer care and the store manager is saying he can't do anything.

An amount of INR20000 is stuck. If it were a small amount I could just let go. Next recourse will have to be legal. Coz not only have they stolen from me but also taken away my mental peace.