Airtel — Not able to send port message

Dear Sir,
iam not satisfy with your Internet Network
Coverage n Data Packs...Hence, i thought to move to BSNL...then i have started
to send SMS to 1900 for Porting...
but, iam not able to send only for 1900... "message Could not sent" is showing...tried 10 time...

Thing is I am able to send all the message but not only to 1900

I don't think so it's ethical practice
And I am trying to call the customer care no but everytime just not able to connect threw any no.

So please help me to change my service provider

Thanks and Regards
Chintan