Reliance is cheating the customers

Hi, I have Reliance Wimax 750 plan(4 GB download) and my billing date is 11th of every month. Frequently i will check my data usage and i will make sure that i am not using more than 4GB of data.This month my bill got generated and i paid the bill(it will be always 827 rs and always i pay well before the due date). But when i checked my profile again on 19th, one more bill was generated and i have been charged with 2000 Rs for the data usage. For just 7 days i have been charged 2000 rs..When i contacted the customer care, they told my billing cycle has been changed(for which i have not been informed) and it is now 19th of every month and i have been charged on prorated basis. For rental it is fine, but for data usage how they can take prorated into account?. Overcharging in the bill has happened 2-3 times before and when i contacted the customer care, i have been told i have used more than 4GB, which i have not. That time it was 200-300rs, so kept quite. But this time it was almost 1000 rs which is not acceptable. I am very much disappointed with this and i have decided to terminate the connection. Reliance is cheating the customers. Please check your bill properly before you pay.

You should have gone through the entire forum, You will understand that you need to be away from a moron called "Reliance"!If possible, Drag them to consumer court!