Airtel — I could not able to send messages

Address: Dev sanskriti university, shantikunj, gayatrikunj, haridwar-249411, Haridwar, Uttarakhand, 249411

From very long time I could not able to send messages to other person. My outgoing messages are failed during sending and I try to call customer care many time but nothing happened. Even checked many mobile setting to solve this problem.pelease solve this problem so that I can use my mobile message.