Vodafone India — About my sim card

Address:

600097

I not using my vodafone sim [protected] since january. At that time itself i told the vodafone customer care representative that "i am not using this sim cut it". But few moths later they issued a case against me in court with an unpaid bill amount of 5000. And i paid the bill and told them to cut the sim once again. After two or three months they again registered a case against me with a unpaid bill amount of 1000. Since i am not much aware of the court formalities i also payed the amount, and once again told the representative to cut my sim.
But few moths later they again called me and asked for the payment.
What should i do???