Air India Express — complaint about refund

Address: abu hail

On dec 8th 2019 i book a ticket from shj to trivandrum using credit card. By mistake the date i have selected is wrong. That's why i cancel that ticket within 1 hour. After i got a confirmation email also. I contacted air india office in dubai. They said that email on [protected]@airindia.in. So i email on this email 4 times. They reply that refund money will credited within 20 working days.