Idea Cellular — Incorrect internet billing - idea

Address:

Pune, Maharashtra, 411027

Bill no :[protected]
Network: idea
Post paid plan: t1160-happy 249 retail plan (Includes 512 mb /month)
Billing cycle starts at every 27th of the month (Refer attachment).
Unnecessary internet charges were applied in billing from 27- april to 30 - april.
On those days it is constantally increasing my unbilling amount. Immediately i approached all ways to find the problem. Called to customer care, visited store. Every one said we cannot tell now until bill is generated, but every one assured that i am having active 512 mb plan. I have recorded audios as well, but no option to upload audios. After billing cycle i mailed complaint, but no use - i have proofs for all. I dont no even video is not uploading in this site.