HDFC Bank — Credit card

Since 1 yr, I've been trying to resolve this issue with HDFC. I had requested HDFC for my CC cancellation. However, they still renewed my CC & wrongfully charged me renewal fee. Here are details
-15 Mar 2020-Last usage of my CC; I never used the CC again
-18 Mar 2020-Contacted Customer Care via phone asking to “CANCEL” my CC. The rep informed that PhoneDesk is short-staffed due to covid & can't take my cancellation request
-Between 18 & 19 Mar 2020, I spoke with 3 different reps on phone. However, they kept convincing me to keep using the CC & NOT cancel it
-23 Mar 2020-I sent email to customerservices.[protected]@hdfcbank.com & [protected]@hdfcbank.net requesting to CANCEL my credit card. No response from HDFC
-1st April 2020- I sent another email to HDFC asking for status on my CC cancellation request; No response
-24 April 2020- I sent email asking for status; No response
-13 June 2020- I rec'd email HDFC. However, the email had no response to my CC cancellation request. Instead, this was a mass email sent to all HDFC customers saying “due to prescribed COVID-19 protocols, our offices are operating with limited staff. Please use our digital channels to address your needs”
-14 June 2020- I responded to above email & informed that neither HDFC's website, nor email & phone communication have been able to help me. Please look into my CC cancellation request. No response
-21 June 2020-I sent email to the bank asking Why no action has been taken on my CC cancellation + instead of cancelling, why HDFC renewed my membership & put charge of Rs 2500+GST+Finance charges. No response
-25 June 2020- I got email from HDFC. Again, it was a mass email sent to all HDFC customers & had no mention of my pending request for CC cancellation
-28 June 2020- I sent follow up email; No response
-2 July 2020-I sent follow up email; No response.
-After above email, there was no communication for the next 6 months until Dec 2020
-4 Dec 2020- I received email from HDFC's CC team. However, there was no mention of my CC issue. Instead, HDFC offered that they will roll back GST charges but I will have to pay the card renewal fee.
-10 Dec 2020, I replied asking HDFC to pull out all my previous emails. I had requested cancellation in March through email. Still, HDFC did not cancel & rather renewed the membership forcefully without my consent.
-15 Dec 2020- I sent email asking HDFC why they're not investigating & reversing membership renewal fee, which was wrongly put by them.
-16 Dec 2020, I sent another email asking if there's someone in the CC team that I can speak with or meet at HDFC branch to settle this matter. No response from HDFC.
-Between Jan 2021 & Feb 2021, I started receiving calls from HDFC’s Collection Department asking me to pay the renewal fee + the interest fee put by the bank. I tried explaining the reps that this was actually a mistake from the bank’s end, but there was zero level o[censored]nderstanding. Within a month and a half, I received more than 160 calls from HDFC’s collections department, sometimes at 6:30 am in the morning. The Collections Department harassed me by constantly calling and not listening to what I had to say about the wrong charges put by the bank.
-Till date, there's no response from HDFC reg:
1.Why my request for CC cancellation was not acted upon?
2.Why my CC was forcefully renewed even after requesting cancellation?
3.Wrong billing of CC renewal fee+Interest+Financial Charges+GST.
4.Mental agony & continuous harassment through Collection Agents & Wrongfully impacting my CIBIL Score.
5.Wrong reporting to Credit Information Bureau which lowered my CIBIL score.
6.If the bank was short staffed in March 2020 & could NOT work on my cancellation request, why should i pay the renewal fee for the card which has been wrongly put on my account by HDFC?
I have complete Documentary Evidences in this regards. Please help me in getting a logical response from the bank and get them to correct their mistake.