Jubilant Foodworks Limited — order cancellation/refund

Address:

122001

I placed the order for pizza from domino's ansal plaza location gurgaon. Mr. Vikas from the location contacted and cancelled my order stating they cannot deliver pizza at my location whereas in the past they had delivered the orders at my location.
When the delivery was done in the past too at the same address
When asked about refund they said it will take 7 days for refund.
Now when we are placing the order payment is deducted immediate online. They are refunding the amount online then why it should take 7 days process.