Tata DoCoMo SIM — Unnecessary Deduction

Address:

Maharashtra

My number is +91-[protected]..i was charged Rs 79/- for something i am not even aware of. when asked the customer care they are not willing to provide any details nor ready to refund a single rupee. they are not even ready to lodge a complaint nor provide an complaint no. After asking them twice they cut my phone and blocked all my calls to any of the customer care number.
till date i am not able to contact them . this all took place on 11th of January 2013 at 12.47/ 12.49 pm. after that i am not able to talk to them again coz of being blocked.
please help!!