Flipkart - Flipkart Seller cancelling refund of wrong product

Dear Voxya,
Please help me to get refund from Flipkart. They have delivered me red coloured polyester suitcase but it was written as blue polycarbonate suitcase. I requested return but they said that ** rupees will be deducted for return. Then they created so much trouble in whole return process. I had written atleast ** emails for return pickup. Now after picking up the product they refused for refund saying that seller is not ready to refund. Please help me to get refund from Flipkart. I am very much disappointed from Flipkart fooling customer in this way.