Flipkart — Shoe not Exchanging

I ordered puma shoe from flipkart and I got it on time. But unfortunately that shoe is not fitting in my feet, so I requested for exchange the same shoe with smaller size. Then they said it will pickup and exchange the shoe within 27th December but no one came and picked up the shoe. I complained about it in flipkart, they said it will pickup within 30th December. I got message on 30th that your product will not pickup today, will pickup tomorrow. everyday I'm getting messages and no one coming for pickup. this is totally harassment. I never faced like this before. Totally pathetic service of flipkart. I paid for product, I'm not getting it free of cost. I never expected from flipkart. I read all policies of flipkart and they promised they will deliver and exchange within promised time.
Today I got call from flipkart and the guy cancelled the exchange without my permission and said i will again request for exchange but he didn't. what the hell! he said within 2 hours it will happen and solve your problem. but it not happened. Again I requested for exchange by my own.
so harassing and worst service of flipkart. and third class of customer service of flipkart. They should pay for this misbehave. I paid for the shoe for my trip. I needed the shoe.

Order Id: OD[protected]