Sterling Holidays Resorts is Refund not being paid

Had booked on 14th July 2021 and then cancelled it after 5 mins. As per the terms laid out to me, full amount should be refunded to me if cancelled before 15th July 2021. Wrote for a refund of the money, thereafter received a mail from Sterling Puri that they will issue voucher of same amount, which I declined and asked them for a complete refund as per their terms and conditions, have written multiple times to them, they do not respond and have not received the refund till date.