Refund Short Paid

At the end of July 2017, I received a notification of my annual increase for my car insurance. I notified my broker, Carroll Venter at Clever Cover that I would reduce my cover. Due to their mistake I was billed incorrectly by Santam but I was assured that I would receive a refund for an amount of R72-00. As it happened I cancelled the cover on the 15th of August and asked for a rebate for the month as well as my refund of R72-00. We are now going into the second month and Santam have not refunded me for the full amount and after numerous emails are still disputing the amount for my refund.