Idea Cellular — invalid balance deduction from my idea prepaid

Address:

Dehradun, Uttarakhand, 248001

You people just deducted 21 rs. From my prepaid idea connection without my permission. The message just says that you have been charged rs. 21. Another message came with a link that says enjoy games on gamefun. I didn't buy any game. You guys are cheats.
I don't know why this has happened but i want my money back. Plain and simple. Else i'm switching to another network. I have had enough of this.