Flipkart — Received wrong product but return guy not picking product back

I ordered flipkart smartbuy stylus pen for my iPad for 1699, thinking that it's flipkarts own smartbuy products and won't face any problem but instead I received a pack of reynolds 5 rs ball point pens and when I placed return request the delivery guy who came for pickup says that he can't pickup the product because it is a different product. But that is the reason for returning the product. How difficult is it to understand. After speaking to their customer care another return request was placed and this time he didn't even call me for pickup but i received a msg at the end of the day that return cancelled because I decided to keep the product. This cycle keeps on happening and everytime the customer care executive assures me that this time product will be picked up but same time is happening for more than 15 times in 5 weeks now. Fed up with their customer service and delivery service. Also the customer care calls get disconnected automatically after a few minutes. Worst experience ecer.