Tata Indicom is the lousiest service

Tata Indicom is the lousiest service I have come across. In my frustration, I finally had to surrender the connection. Six months after I surrendered the connection with proper acknowledgement from them, I still received monthly bills. And Bill collectors visited me to check up - I had to show them the surrender documents which luckily I had preserved !
If there are any instrument related problems, The handset has to be sent to Delhi - wherever the customer is located. They dont have a center even in Mumbai! And they refuse to provide temporary replacement sets. Dont know how long they will survive in the market.