Airtel — mobistore activated with knowledge

Address:

Kollam, Kerala, 691508

Sir/ma'am,
I am an user of airtel mobile number [protected]. Till yesterday i had a balance below 10 and my sim was in a base model china set. Yesterday evening i recharged my phone two times with 70 and changed the sim to a smart phone. Till yesterday i had a balance of 105. Something.
Today morning i woke up at 3:30 to have food for fasting and i had turned the phone into flight mode to save battery charge and just opened and replied to some messages on whatsapp through wifi. Then i slept and when i woke up at 9 and turned the phone back to normal mode i got a message that mobile store service has been successfully activated on your mobile and you have been charged 70 rupees. I called the customer care and they told the service has been activated through internet. See my phone is a rooted one with a custom patch so doesn't shows any ads. Then regarding browsing also i checked the browser i haven't browsed any site today and haven't seen any history of airtel site in the complete month. And even if i had clicked on the service activation page the sim needs to send that information to telecom. How can that happen in flight mode. When i asked these there was no response and she just kept in saying i had activated service through internet and she just has the option to deactivate. Then i told i want to talk to an higher official and my call was transferred to a lady named mary. I told her the problem and she first said the service might be activated within any time in 72 hours and when i told till yesterday my sim was in a base model phone she said the service is activated via sms. I asked in china phones the ussd pop up don't come so there is only one way to activate that is by sending message and in my sent box also there is no message then she was like repeating the usual line like you have only activated the service and we can't do anything but cancel it. Then finally just before hanging up the reason they told me was when i insterted the sim in smartphone they got a stop request of flash message. I don't know if sending stop messages activate services. And that too wasn't done by me it's automatic. This has happened before also when i had put my sim in smartphone. The moment i turn the phone on i would get a message that last message cost was 0.00 but the only difference i could find was that this time i had a high balance.
Kindly provide a solution.
Thank you