Flipkart — Exchange policy and cancellation without my consent

On 21 December i ordered ZuJoz Men Embroidered Straight Kurta of l size .i received delivery on 27 th and the colour was purple kurta was tight for me so i requested for exchange of size so Xl was not available in stock so i exchanged it with blue colour XL size I saw delivery date was 3rd of January when i checked in 3rd it shows the delivery date was changed to 9 th of January i called customer care they told it's deleyed but surely u wil get it by 9 th but when I saw on 9 th the product exchange was cancelled i asked them why they saying due to unforeseen reason ...and they told me to take refund i told i want product exchange only they told that is not possible ...when i checked price it was 1249 and i bought this kurta for 852 ...i was shocked to see this .so they refunded my 852 but in this process they wasted my 15 days almost and i couldn't bring from market due to this .what is my mistake in this now they are telling to palce fresh orderd ... though product is in stock they where not ready to do it ...what kind of policy is this Flipkart and seller both cheating customer ...worst policy exploation of customer for own benifit ...why i should pay 400 extra this is worst policy i have seen ...seller is ZEDINOVETION