Airtel — sms incoming and outgoing is blocked

I converted my telenor number to airtel 4g on 6th november 2018 and got the number recharged by rs149. The number started on 7th november 2018. Internet and calling are all ok but sms service is not. I'm not getting any sms on my number and even can't send any sms. I've unsuccessfully tried manier times to contact customer care executive. Now the ussd *121# is also not working