Zomato — order a cake

Address: #28, pranamya opp to siddeshwara temple, sidedahalli , Bangalore- 73, 560073

Website: Zomato app

I ordered a cake through zomato with a wish to be written on cake & paid amount.
But the restaurant declined to write wish & told me to cancel order. I cancelled order but still the amount 302rs is not refunded r product delivered after many mails & msg issue is not resolved.

If they can't fulfill the instructions then why do they accept the order.
They are telling as per our policy there is no refund bcz of food wastage policy.
I cancelled order within seconds as i placed order. How does it's food wastage