I have two sims of Docomo, both are working are fine, if you have read the news in the last week Tata has declared that they are shifting all their Telecom Spectrum and customers to Airtel, so it should takes few months to complete this transfer.
In the mean time, you can recharge on tatadocomo.com, Paytm etc. It is obvious that most of the small recharge guys will stop supporting Docomo products as they are shifting the assets and customers to Airtel but the Official Tata Docomo stores are still open and working