Airtel — fraud by company

I'am customer of airtel dth since december, 2018. We have two connections for which we are paying 1032 rupees since four months. Connection001 has mega hd pack and 002 has base sd pack. Both are monthly packs
Around april or may sorry i don't remember the exact month, i got a call from airtel dth forcing me to buy their offer. But i rejected and told them that iam happy with my current plan and i don't wan't to change it. She tried her best to change my mind to buy the new plan but i didn't accepted it by saying that if i found that i need to change my plan i will do it please don't force me to accept your offer. Again around september i got call from airtel dth just like i have mentioned before, forcing me to accept their offer, but again rejected by giving them the same reply that iam satisfied with my current plan.
I recharged my account at 3/oct/2019 with 1032 rupees at due date but at 5/oct/2019 i got message from airtel that 'your account is updated, airtel pack added dabang sd 3m pack 'and deducted 691 rs from my account balance. Now my account showing that the due date for my recharge is 15/oct/2019 which suppose to be 2/nov/2019 because the recharge which i doing since 4 months gives me 1month validity, but this time my validity is reduced to 12 days. Now my question to airtel is that when i didn't changed or included any plan on my account then why you deducted my 691 rs from my account without my consent. I needed my refund back of 691 rs which you deducted fraudulently from my account by charging for the plan which didn't started.