Airtel — Mnp/port sms failed

Address:

Dasarahalli post koratagere taluk tumkur district

I have balance in my account and active pack too but i couldn't send a sms to 1900 . But i can sms to another mobile numbers successfully here the problem is airtel is not permitting me to send 1900 number .
It's a planned scam to protect their customers and it's a fraud by cheating customers f4om porting to other network providers.