Mts — Despite putting up the request to deactivate the data card, they keep sending the bills

Address:

Kolkata, West Bengal

I had put up a request to deactivate my data card number [protected](kolkata circle) on 5th march, to which the customer care said we have accepted your request and your number will be deactivated. Despite putting up a request to deactivate, Next month they send me bills, to which again I put up a request with customer care and they said you need to clear the dues. which I did, and for the next 2 months they send me bills again. Now what does this means, they are harassing the consumer. And after that they call from a random number and say you have a case hearing. Such ruthless company... And after that I enquire the customer care regarding that I have put up a request to deactivate 4 months ago, they say we will forward your request to backend customer care. What rubbish company is this to harass people unnecessary? I want to ask this company after the customer has filed a request to deactivate the number, what steps should be followed?