Sangeetha Mobiles — Cash back - false promise

I had ordered iPhone 13 on 14th March and they said it will delivered on 15th March but it was delivered today on 16th March. On the site it was mentioned that 2000 cashback for HDFC credit card payment I also called customer care and made confirmation that cash back will be applicable only if you pay payment through pine labs payment method so I did the payment through pine labs payment method but still the cashback was not recieved. Then I contacte the customer care through chat then they was saying that through online payment cash back is not available only if you pay through offline store cash back is applicable. Please provide the cashback as promised or else don't follow the customer going forward try do a genuine business and attract the customer through proper business model