complaint against Matrix Sim card

would like to inform you with extreme disappointment, that i was lied and convinced for taking this particular Matrix student plan. Before, coming to London, i had reconfirmed with Mr. Biswajeet (kolkata, India), that i could terminate my plan within 12 days after the activation of my Sim Card(without any charge) After the 12 days i would be expected to pay the amount for the whole year in order to terminate my contract.
But, now from the time i reached London and found a better plan, Mr. Biswajeet has not been responding to my calls or mails. Finally, when i did talk to him he denies of having said that. Also, even after repeated requests he hadn't given me or even shown me the contract. Niether i nor my father (payee of the cheque)had signed the contract or even seen it. So, we had to believe what he said for that moment, moreover all my cousins and relatives had taken Matrix, so we had never expected we gt cheated.
Anyway, all i want right now is to terminate my account and get my deposit refunded as we were fooled and tricked into this plan. Also, this is a request that you take a very serious action against Mr. Biswajeet. Please, let me know i could file a complaint against him in any other place as well, as i really think he has no right to spoil the reputation of Matrix, by telling and promising wrong things.
Hoping for some immediate action.