Makro overcharges and doesnt issue a refund!

I made a purchase online at the end of January and was overcharged. I queried this by calling Customer Care and was advised that my query was logged with the relevant department to issue a refund. Its been almost a month and half and I have still not received my refund. All I get is automated messages when I sent an email to query the status of the refund. I am highly dissatisfied with Makro. Poor service and I will think twice before purchasing anything online from this retailer.