Mtailmodeecom Flipkart — Received wrong item

Website:

www.Flipkart.com

I ordered ambrane powrbank and i got delivered on 17 October but after checking it i check it was defective piece so i poace replacement request but seller reject but in 3rd attempt seller accept and send new one in replacement but i am on school that's why my grandfather took the parcel and he didn't open it in front of delivery boy because he didn't know so much after i come back to home i check this is another powrbank from local company not from abrame company so i place refund request but seller reject my request everytime and i try to contact flipkart but can't but in somedays flipkart contact me and say sir we understand we can give you refund before 28 or 29 October but I didn't got sny refund please help me to bring my money back