Sahil bro, when you recharge with Rs. 210, the Cinema Plus pack gets automatically renewed. Hence balance gets used there and balance in account turns Rs. 0/-
If you want to change pack then, you have to recharge again for the amount of the pack. After you recharge, call CC and tell them to activate the pack you want. It will replace the Cinema Plus pack and you will get refund of the Rs. 210 depending upon the days you used it. If you changed it the day you activated it, you will get around Rs 205-210, etc.