Idea Cellular — Rs 29 deducted in the name of mydala

I had just recieved the below msg to my phone..

Dear customer,
Thank you for downloading mydala powered deal from mydala.
You have been charged rs. 29
Your balance is rs. *..

What does it mean.. When i call idea customer executive, they told a third party has activated this deal.. I am hearing about mydala first time.. For what and with whose permision did they have taken my cash from my account.. This is actually cheating and stupid.. I need complete amount back to my account within one day..