Don't want to refund me

On the 25th I called into the call centre for my line to be reopened as it was blocked. Vodacom agent told me to deposit the money in they account and the lines will open. So I did and when I checked my statement the following day they doubled debited my account as well. Now that I asked for my refund the agents sends me from pillar to post. Not one agent has an answer and if I want to speak to a manager they never around. What type of service is this. It's been over a week and not even one call to say we are looking into the matter or you will get your money within a week or day nothing.