Idea Cellular — deduction of rs. 21 twice

Address:

Indore, Madhya Pradesh, 452009

Hello, rs.21 has been deducted apparently for no reason. This has happened before as well. The last time we checked with the customer care, at first they told us it is due to some game played by us on phone. I called back again. This time they said, maybe some services are activated.
We did not activate any service. And if you activated the services without our consent, it is your duty to send us back our money.
But they responded that we cannot return the amount but this will not happen again. But it did happen again today. This is unacceptable behavior. At least give us a reason correctly or guide us how to stop this scam.