State Bank Of India [SBI] — redemption of rewards points.

Address: 641006

I am having a sbi credit card for my use issued by the kvb. So far i have earned more than 7000 rewards points. But i am not able to redeem the points for the purchase at any shops or textile shops etc.in this condition every month the points are reducing without any use to anyone. What is the use of giving such points on the purchases and what is the reason for reducing the points in each month. At least the points may be deducted for the payment of my bill for this month. Please do something to utilise my earned reward points.