MTN SA Stole my money!!

I've been trying for 2 months to get refunded after MTN *******ly debited my account twice on the same day - 1 August (31 July on their system). Nobody can tell me what the second debit is for, but they have told me there is no problem with it. The call centre people are in the firing line - the Banking Department just disregard any input or evidence and hold on to the money they stole. I've had it