Myntra.com — regarding refund

Address: Pune, Maharashtra, 411030

Website: Myntra, online shopping

I had cancelled one of my order on30th march but i didn't get the refund till date. When i called their customer care they told me that refund has been initiated and had given me some reference number and told me to contact the bank but bank also couldn't trace that number. As it is very hard to follow up with bank every time, so what should i do to get my refund