Myntra.com — Chemistry women burgundy jacket

I ordered chemistry edition burgundy jacket from them in size small but they sent me wrong size which was large now they are not giving me my refund back and just to give the profit to the seller they are telking me the product will be reshipped to you beacause it was used ...i mean tbat is the height of lying we are spending money they are getting profit but there is a problem they are saying tjis is our policy u have to keep it...how unprofessional and cheap