Airtel — sms outgoing service not working from past 10 months

Address:

600097

I have an airtel number from past 12 years (Same number) and till airtel got merged with aircel last year around same time, i was not able to send any sms out since then. Worst case, if i want to port my number to other carrier, even that is not possible as all outgoing sms from airtel are not working. It gives a message "message not sent" and i checked sms service center number, changed at least half a dozen sims from airtel in last 1 yr and even gave my sms to airtel store service guys to place on their mobile and try sending sms. None of them helped to fix it. I now have a new habit of raising 1 complaint request with airtel every month and after it is gone to network engr and everyone else in that company, it gets closed without my consent and the problem still persists. I want to complaint against airtel for 1) not able to give sms outgoing service 2) not able to even switch to other carrier with same number (For this you need to send sms to 1900 with port which is what i have problem with.
Please help.