IndiaCakes.com — Canceled order but not received my refund

I ordered a cake online on IndiaCakes (Order[protected] around 11:45 on 7th April for Rs 518.81. After about 45 minutes I received a mail and a message to pay an extra Rs. 275 for the delivery charges with a payment link given. These charges were not asked nor they were shown at any time while I was paying earlier that delivery charges will be added later after payment. Since the delivery charges were quite high, so I replied to the mail to cancel my order and refund my money. Since then I have been trying to reach via email as well as via customer care number to ask my refund status. But they are not responding at all on emails. But somehow I manged to talk to customer care once in 10-15 times I have called and they told me that refund will be processed in 3-4 days. Today 3 days passed and when I again called them, after a long waiting they replied me that I will be refunded through coupons which is totally senseless. Again I will have to order to avail the coupons and have to pay extra delivery charges because of which I had to cancel my order at first place. This is nothing but fooling customers. There is no such information given on their website regarding extra delivery charges as well as regarding the refund process. Please help me in this matter.