Pizza Hut India — no refund for cancelled order

Address:

500049

I ordered from pizzahut, jayabharthi's kalpana survey no.44/1, 50, 51, mumbai road, hyderabad store on 12/08/2017 but due to delayed delivery, i cancelled it. The customer care people said that my money will be refunded within 21 days but despite several reminders and mails, my money has not been refunded. The order no. Is 8838796 and the amount to be refunded is rs.317.42.
Kindly do the needful.