Myntra.com — automatic order cancellation

I had purchased an mast & harbour t shirt from myntra on 23rd jun, 2019. The order number is[protected]-1459803. The product was not shipped for a long time and i called myntra multiple times to check the status. They told it's in process and will be delivered. Finally they raised a complaint (In[protected]) on 5th jul, 2019 and told it will be serviced within 72 hours. I waited again for 3 days and called them as it was not processed. They kept on lying and told multiple reasons for delay and only asked me to wait. Finally, on 12th jul, 2019 they cancelled the order from their side and initiated my refund. However, they have done a fraud as they simply deducted my money and kept it with them without any service or delivery. I had requested them to give interest on my money and some extra money for harassing the customer.in the cancellation mail they gave me a coupon which gives less discount than the default coupon applied. This a complete pathetic service for such long and at multiple levels of myntra support team. They have cheated me with my money.