Porter — My booking cancelled but booking amount not refunded by porter

I booked packers and mover on 31 march, at the time of booking, they said the team would arrive 10 minutes earlier than the time I provided. after 3 hours of waiting 3 hours and no one had arrived, I requested canceled my order after 4 hours of waiting, and they promised to refund the booking amount within 2 days but now its more than 1 week i haven't received my refund and they have not replied on my mail yet, they are not refunding my booking amount which is 500 INR.