Idea Cellular — Idea pro-ration charges.

Address:

Pune, Maharashtra

I am using Idea post paid Corporate plan. In last month I have changed plan to 299 Monthly plan where I am getting 750MB 3G Data and then I am getting unlimited 2G data at 64KBPS speed (Actual speed is only 5kbps). But when I receive bill on my email, I am shocked !!! They applied pro-ration charges (that I don't know actually what it mean) 687. Please help me