Filpkart - Returned Item is not picked up yet

I am ordering a shoe to the filpkart on **th December ****,the product is delivered on *nd January ****. The product was detected and also used product.so iam return (refund) the product but delivery boy couldn't accept the pickup because its used product so he told me to complain report to filpkart service because its used product.but many times I am calling filpkart customer care but they cancel return request *times. They increase return time.they couldn't positive response.so what can I do?