HDFC Bank — No Objection Certificate for Credit Card

I am writing to you because I want NOC of my credit card, last month i permanently close
my credit card even the customer care people also confirmed that your HDFC regalia credit card permanently close
but they not provide me any deactivation proof since last month, even i sent handwritten letter to
chennai office but they also not give me any confirmation to my NOC please.
I didn't understand what service you provide to customers. Some customer executive people said like you will
receive this month and some of them said 1 month you can get your NOC.
Please look into this matter and please issue my NOC ASAP.