Unauthorised debit order & delayed refund

My account with Vodacom is paid up to date. Yesterday Vodacom submitted an unauthorized debit order on my account for an amount of R2400. When I called them today to query this and request a refund, I was informed that there process takes 2 weeks before I will be refunded. The fact that they incorrectly debited my account yesterday is not my problem, the fact that they processes are pathetic and takes 2 weeks means that me as the customer is inconvenienced for 2 weeks. I've been a customer of theirs for 16 years and my average bill is in excess of R1300 per month and this is the pathetic service I now receive.