Vodafone India — Unauthorized balance deduction for some caller tune service

Address:

New Delhi, Delhi, 110085

Vodafone had deducted rs 10 from my account & activated some song as callertune without my permission on "10 nov 2016"
I called customer care & asked them to immediately stop the unauthorized service & refund my money. The person said that he will do so & the service will get deactivated in 24 hours.
Since the money had not been refunded to my account later, i called again after 24 hours time period, but they refused to refund the same.
Kindly look into this.