Oppo - I buy a product by Flipkart on no cost EMI but Flipkart charge interest

I buy oppo K** *G oder detail -OD****************** Xonique Ventrues Pvt Ltd ,
Ship-from Address: Sunsat warehousing Pvt. Ltd., Hadbast No. **, Village Sanpka,Tehsil Farukhnagar, District - Gurgaon, Haryana-
******, Farukhnagar, HARYANA, India - ******, IN-HR
GSTIN - **AAACX****R*ZT
Total items: *
Product Title Qty Gross
Amount ₹
Discounts
/Coupons ₹
Taxable
Value ₹
IGST ₹ Total ₹
Handsets
FSN:
MOBGEWUYZ*Z*FSQG
HSN/SAC: ********
OPPO K** *G (Ocean Blue,
*** GB)
Warranty: * Year Manufacturer Warranty for
Phone and * Months Warranty for In-Box
Accessories
*. [IMEI/Serial No: *************** ]
Includes 'No Cost EMI Program Discount' of
Rs ****.*
IGST: **.* %
* *****.** -****.** *****.** ****.** *****.**
Shipping And Packaging Charges * **.** -**.** **.** *.** **.**
Total * *****.** -****.** *****.** ****.** *****.**
Grand Total ₹ *****.**. But Flipkart charge interest