Airtel — airtel airtel fraud sms charges on my postpaid bill number[protected] &[protected]

Address:

570017

My airtel postpaid bill for the period:
11-march-2018 to 10-april 2018 : bill no:[protected]
11-apr-2018 to 10-may-2018 : bill no:[protected]

It is showing as i have send international sms
To the number: [protected], 25 times in april and 91 times in may.

April month they have charged for 26 sms @ the rate 5/msg which comes to : 130.00 =tax
May month they have charged for 91 sms @ the rate 5/msg which comes to : 455 +tax

But i haven't sent any sms to any international number in my life.

When i checked online the same number found
For fraud in airtel's other customer complaints too.
I guess its a fraud from the company.
If i call them upfront they are asking to pay the bill as they know the background.

And they have disconnected my number for not paying this bill

Airtel is cheating customers. Whom i need to approch to get the solution for this problem.