HDFC Bank — Fraud in my credit card

Address: BALASORE,ODISHA

I have a credit card no. 5589 83xx xxxx9548 issued by hdfc bank, balasore branch. I noticed from my billing statement that there were fraud transactions made in my account since last two months. Last month being billing period (16.4.20 to 15.5.20) was mostly under lockdown, i did not check the billing as i did not use credit card since last more than a year. The credit card is linked to sb account for payment, which i could not notice. Yesterday, when i received the credit card bill (16.5.20 to 15.6.2020) i noticed few payments made to paytm. I also noticed that 9000.00 credited to credit card account on 4.6.20 for last month fraud of 9000.00 by paytm.
The total fraud amount is 14182.00 in last 2 months. So i immediately blocked my card yesterday at about 01.10 pm. Today on 18.6.20 i sent a complain letter to hdfc bank balasore for the same. They simply received the letter.
So i request this complain should kindly forwarded to proper authority & 14182.00 debited by my credit card amount is to be reversed immediately.