Airtel — cancellation of international roaming

I am residing in saudi arabia.
Using my airtel indian sim for receiving bank and other services otp's mainly.

Because here local sim calling charges to india is far more better compared to airtel roaming charges.

Sometimes unexpectedly i make call from airtel sim since i keep two sims in one phone this happens.

The moment i realise that i made a mistake, rs.99 will be cut from my account and international roaming will be automatically activated.

And there is no option i find to deactivate the service to avoid auto renewal.

Please provide me an option to deactivate the international roaming service.

I kept searching on internet but there is no solution.

Thanks