Vodacom hasn't paid back my money

There was a double payment made on my account. I have requested a refund which I was promised payment of 8 working days ago by a consultant called Crescentia. I called into Vodacom today (30/10/2015) to follow up only to find out that no request has been put through. This is such an inconvenience, because I have to keep calling in to get my money back. Please can Vodacom just refund my money!!!