Consumer Redressal

I have a Vodafone Postpaid number having fixed rental 199 + 250 (1GB 3G internet). On 23rd March 2014, I requested for an additional 1GB 3G internet worth Rs. 250 by sending SMS. But I got the following reply \"Your request for ADON pack cannot be processed since you are active on Unlimited Internet pack\". So, I had a talk with Customer care executive and got the same reply from him also. So, I got another ADON plan 300MB 3G internet worth Rs. 100 activated as suggested by customer care executive. But, in my current bill summary, I am charged for both ADON packs 1GB and 300MB. Now, the company is not willing to revise the wrong bill. I got the reply that the 1GB ADON pack was also activated on your number and you are billed correctly. If 1GB Adon pack was activated, then Why was I misinformed via SMS and by customer care executive and another ADON was activated. I do have the \"Service cannot be activated\" SMS with me as a proof. Please help me revise my billing amount.