Tata Docomo — Wrong deduction of mobile balance

Address:

Pune, Maharashtra

I made a special recharge of Rs/- 151 which provides 350 minutes of talk-time from the web-site of Tata Docomo on 7th March, 2013. I recharged it only once, but they have deducted my money twice and hence they have deducted Rs/- 302 from my mobile balance. The number I recharged is [protected].
They are making fraud here, because recharging twice for the same recharge using the option "Pay by your current Mobile Balance" is not allowed by their web-site itself (Which I chose to recharge). A message similar to "Pay by your current mobile balance is allowed only once in a week for one recharge option" is displayed if you try to use it second time. How can something happen(double recharge) which is not allowed by them? (Fault from their system of course)

Also, they send you verification code through SMS when you choose the option "Pay by your current Mobile Balance". I received it only once and entered it only once. How could they make a recharge twice in that case?
I tried to explain this to their senior CC executive named Dnyanesh Dhumal (who could not understand English and could barely speak Hindi) at Pune CC, but he kept saying that "Nothing can be done as it has been done by you".

Please help!