Tata Docomo — wrongly amount deduction

Address:

Belgaum, Karnataka, 591311

Sir/madam,
My mobile [protected] balance stilling every month.
There are no vas and services acctivated from me. Still my data balance is 1857.23 mb and validity is 17/01/2019. Customer care executive say me that after your confirmation we activate this service.
We have not request send or say to activate vas service. Then how they received confirmation. They are not refumd my amount rs.12.51. Please check record for my confirmation and help to refund above amount.
Every month customer care executive refund amount and say we have close all service and next time no balance will deduct.
Every time i have facing this problem.
How may people are facing this problem and they are not taken action to service provider.
Thanks