change of tariff plan without my knowledge

Location/place: Bangalore

Name of company/service: airtel postpaid-9972966457

airtel has change my existing tariff paln of future value 299 which iam using it for more than 1 year,without my consent they changed it to new future value 299 callcharge is costly compared to existing plan.
when i interact the matter initially the customer care approved they wont change and i told without my information dont change my existing plan(proof of email in hand)later when the monthly bill came they change the they are not giving a proper answer andthey are not ready to change to my regular plan.
1.How can they change my tariff plan without my knowledge.

Iam not intrested in change of tariff plan.

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