Reliance Digital — False promises of Cash back rs.1500/- by reliance digital store AVADI

Address:

No 6/11, No 5A & B, 6 & 9 & 10, Block 5, Alphas Lotus Tower, Tnhb Main Rd, Avadi, Tiruvallur, Tamil Nadu 600054

I bought few products from digital store, AVADI on 15th August 2022. during the time of purchase, i was ready to pay the complete amount as cash, But the seller asked us to use certain CREDit card (from certain bank which has cashback offer of Rs.1500/-) hence i used the CREDit card for purchasing the product, they said post 90 days the amount will be CREDited to your account, but its been almost 11 months, and there no cash back, i had to email them everyday, not only to the digital store, even to their CEO, but no response,
after so much of struggle, this month (July 2023) digital store CEO CUSTOMER SUPPORT called me and said that my card was not eligible for the Cash back, do they think that CUSTOMERs are ####, they are one who gave false promises of cashback in order to sell the product and again they say my card is not eligible, either they should have to say this atleast before the purchase. i want to file CONSUMER COMPLAINT on the managers of reliance digital store AVADI for that false promises and wasting my time and money.