Airtel DTH TV — add extra monthly pack

Address:

Gharsana, Rajasthan, 335707

My airtel digital tv account id [protected]. Mobile no. [protected]
I had chosen 331/ month plan for aitel digital tv, but charging an additional charge of rs 42/month, than total 373/ month is being charged. I sent mail many times, but no solution was made. Disconnect the phone by telling the cause of technical fault.
I called up a lot of times and told that my monthly charge is not correct, which can be corrected every time i ask for a two hour wait and after a week nothing has been done. Later the plan was advised to change. After changing the plan to 250 / month, adding 42 rupees more is being charged 292 / monthly. Please help.