HDFC Bank — Showing Unknown & Unauthorized Transaction in My HDFC Credit card

Respected Sir,

Sir, as per my Current Month outstanding amount statement show "39460" Rs. Unknown & Unauthorized Transaction in My HDFC Credit card on Date of 05/March/2021. I search and Check all My Transaction related SMS on my Registered Mobile Number, but as per the Current Month outstanding amount statement showing "39460" Rs. to "TATA CHEM CONSUMER CO-OP SAMBHAL", But in reality, I didn't pay the amount, but the same date I paid 390 INR. by the Card vie WIFI mode for fill Petrol in My Activa 125 model Scooter, I Kept the payment slip from the Petrol pump Vendor,
I call to HDFC Care center but they told me, We Block my Current Credit card and raised my concern about the Transection, they already sent me New credit card Request but told me to contact the Cyber cell and get FIR against the Transection.
Sir, they Confusing me for Solve my this issue.

please Solve the issue...