Airtel — stopped receiving sms in my airtel number

I have been using this number [protected] fro m last 6 years
And suddenly from last 2 weeks i have been blocked from receiving sms related to any otp and transaction alerts

Earlier i never encountered such issue

I am receiving dnd related like marketing sms but unlike earlier all otp stopped coming

Please note that i am unable to transfer money to any one because of this issue
Also unable to pay my credit card bill due to the same otp issue
I also did my recharge regularly

Name bishal paul
Mob number [protected]
Location delhi