Tata Photon Plus — Notice sent without proper verification

Address:

Tamil Nadu

Hi, I'm Harish. I bought Tata photon plus postpaid service by jan 2010. I gave a letter requesting connection to be deactivated and closed it by june 2010. The officer told me the amt to be settled. I settled it.Someone has stolen my device too after termination. We found out from the office a month later that the connection has been changed to prepaid, and it is used by another person, along with their contact details. They requested me for a letter for deactivation. But this person has went to the office providing just his Ration card, and license for proof. They have re-activated the account without any intimation to me or my address,etc.That person has changed the name, address, email, contact details totally. Now they have sent me a notice saying I haven't payed the dues of Rs.513 for a pre-paid card service. I told them I have terminated the connection.But they say it differently.
1. Even if I had dues, they should have informed me when I submitted a letter requesting deactivation.
2. They said that legal notice would be sent,if the dues are not paid after intimation of 4 months. But, I have deactivated it by JuneJuly 2010. They have sent a legal notice on Feb 22nd 2011.
3. They have not informed me about the dues during deactivation, or through email or through mobile or through post.
4. If someone has stolen my device, how come they can authorize and re-activate the device without my knowledge. The person has provided only the Ration card and license.When I inquired in the office on August 2010, they said it is under the name of Mohan Raj, his email, his address, and prepaid too.
5.But when I inquired now feb 22nd 2011, they said the address details his in my name, address,email,etc. but it has been changed to prepaid, they dont know who he is where he is from, and what he is doing! How come they send a notice to me!

My number is [protected]