Citibank — receiving due message for already closed credit card

I used citibank for almost 5 years, was loyal customer, paying on time... But then i have applied to close my credit card due to feeling difficulty in banking care as i have visited surat branch, which told for any help don't come here, call customer care for credit card related issues. That day i have talked with customer care to close my credit card before yearly renewal date. He told my card will be closed. I have got sms regarding closed. Then next day i also chatted with customer care to double confirm, who also told me same. And it will not charge for next year renewal. I have attached screenshot here. But since then every month i am getting message and email to pay for next year fees, which is gross neglect and mental harassment from citibank. I am thinking to file fir against this... As i have all the necessary proof audio recording, chat recording, sms...