Tata Docomo — not able to send and receive messages

Address:

Mumbai City, Maharashtra, 400037

Since last 8-10 months i am unable to receive or send any messages from my number [protected]. I tried contacting the customer, they give me same stupid solutions which i have tried for almost 100 times. And even after registering a complain for 3 times they were not able to solve this problem.
I am just helpless.
Message error code - 28
Ims registration - not registered (I dont know what this is but it shows registered for my second sim)
Tried resetting the message center number.
Tried #33*1234# and #35*1234# - it shows (Call barring - connection problem or invalid mmi code)
I even got a new sim from some sources.