Activation of unknown services fraudulently by tata docomo

Tata docomo fraudulently activated "hasya kavita" service on my number on 8 aug 012. I was just surfing the internet and suddenly a message came that "you have subscribed to hasya kavita pack at rs. 53". Before that I was having the balance of rs. 5.53 on 8 aug 012, out of that they deducted rs. .53. That means they deducted all of my balance except rs. 1, because without having the balance above rs. 1 , I can't use the internet. First of all, I want to know that I had the balance more than rs. .53, for e.G. Rs 100 or 200 then they will deduct the whole balance except rs. 1? the same thing happened with me one more time before that, at that time I was having rs. 75 and they activated an unknown service and deducted rs. 74. Second thing is that if they activate any service then will they deduct the whole balance? that means they don't have fixed price of their services? how can it be possible? it surely means that they just making fool of customers by deducting the balances. Now I want that any balance they deducted should be credited back to my account. Otherwise I won't feel any difficulty to share this matter with trai also.