Airtel — not receiving otp sms from bank as well as from different apps

I am trying to send sms to google pay registration but sms are not going and also otp from bank are not receiving, it is not just bank but also i tried to order online from different apps but verification messages are not coming on my number. I have tried multiple time also contacted customer care executive but he is saying that this is the problem from other end not ours.. Also gave [protected] number to enter in message setting but in new android update there is no such a option to save this number. Kindly look in to the matter