Flipkart — My return request accepted but delivery boy cancel my return every time at time of pickup

I order a Rd decore double bed bedsheet from flipkart and received 22nd March.but their colour and size not fit so I return next day but at the time of pickup, deliver boy cancel my return request and when we ask from him the he tell that he didn't received product image, so he dint pickup the product, then I call customer care and je say to again return request and I do 5 times till now but same thing happen and also talk ro customer care 4 times but he didn't solve my issue, today is my last day of return policy, plss help