Airtel — unable to send sms to 1900 to porting out

Address:

Hyderabad, Telangana

Since last 1 week i was trying to send a message to 1900 to port out airtel network. But every time it is failed to send. The reason for porting out airtel network is due to outgoing & incoming services deactivated even though the this sim which i am using for the past 3years.
The reason for this deactivation of services is not known.
After calling customer service to extend the services, they said to recharge with some pack, but still the balance is also available in the account.
& of course another reason is network speed issue which is not 4g or 5g speed.
The airtel network speed is only 2g, making false statements on advertisements - airtel subse tez!!

Please resolve my problem. I just want to unblocked message service to 1900 & i want it urgent.
My mobile no. Is [protected]