Double debit order and wrong amount

Last night Vodacom deducted twice from my account the amount of R431.14. My subscription that I agreed upon was R390, and not to be deducted twice. I tried to contact their customer care line 111, but after holding for 60 minutes I got disconnected. I want a refund for R862.28 and interest plus bank fees refunded. Also I want my eBucks credited and if not done by Monday, the 4th of January 2016 at 23:59, then I want my conrract cancelled with no penalty charges. This is theft. They get a lot of interest from this so called mistake.