Prime Zone Services — airtel deducting rs.20 for prime zone services

Address:

500026

Airtel is deducting rs. 20 for prime sone services. But i have not used any such services. When i call the service centre on 121 they give fake replies.
This is the second time airtel is doing this, last week they deducted rs 30 for bhakti sagar service, when i complained they reversed the amount. But this time they are bluntly saying that i myself have availed primeszone services, whihc for sure i have not done