Tata Docomo — I am not getting internet

Address:

Karimnagar, Andhra Pradesh

I took a new docomo sim as the mobile shop keeper mentioned me that docomo is giving 500MB internet balance for 3 months for new sim...Now my sim is activated and I got 3600 secs balance and 500 MB internet data...I have the internet settings in my mobile...But internet is not loading...It always mentions " Connection failed " ...I didn't see at least a google page even If I spent 2 hours time by pressing homepage... I called to customer care many times..It responds " our executives are busy so please after some time"...But there is no use of it as it responds as usual...I want to know whether it is real data or it is possible to connect internet with docomo....Try to solve this problems...