Flipkart — product malfunction sold during sale

Address:	Near Jubulee Town M.E School, 759001
Website:	flipkart.com

They were hosting a sale. I got a pendrive in the sale for around 1000 rupees. It said to be usb 3.0 with write speed at around 30MBPS and read speed around 75MBPS. But when i received the product and checked for speeds the write speed maxed at around 7MBPS and read speed around 30MBPS. I tried to contact them they said they can provide a refund only but when i ordered the product page showed 10 days replacement policy. They kept my 1000 rupees with them for 2 weeks and then asked me for sending the product back and take a refund.