Reliance Data Card — After disconnecting the service, bill received

Address:

Chennai, Tamil Nadu

I have requested to disconnect my data card connection [protected] in customer care on 30th April. The complaint number is[protected]. They said it has been disconnected but still am receiving bill due message. I have called customer care several times but no proper response. I have visited Adyar Reliance world 18th Aug. They said they will send a request mail to someone and the card will be disconnected in a week. But today i have received a message from reliance that i have to make a payment of Rs 438 immediately otherwise they will file a case against me under section 406. Please help to resolve this issue