Myntra.com — Return item picked up but marked as failed

I have purchased a product from myntra but it was a bad fit so I initiated a return ..item was picked up on the pickup day...but I was shocked to see that delivery executive has marked the pickup as failed...he collected item from me and marked it failed...now when I call Myntra customer care they say they can't do anything...it could be an error from delivery guy part but why should I pay for it...or it could be a fraud from myntra that they collect the product and mark it as return failed ...don't worry I have cctv proof and I am going to book them for fraud... this is harassment and fraud both...Myntra you failed