Unauthorized debit

This morning my account was debited by MTN SP for the amount of R 1726. I do not currently have, nor in fact have ever had an contract with MTN! In spite of numerous attempts to contact MTN regarding this, I have not being able to speak to anyone from the company. My e mail sent first thing this morning received a generic response with a number to contact if I deemed this to be an emergency. I called the number, but it requires you to enter the cell phone number pertaining to the query.... Pretty useful in my case. I then received an e mail from Sylvia Makgopa from customer care , in which she told me to contact MTN direct at ***. Apparently my problem does not warrant any response from the customer care team. I've since repeatedly phoned that number which goes through to the MTN call center which is apparently closed!! I've since sent repeated e mails to Sylvia Makgopa, but have had no response. I'm pretty disgusted at the complete lack of response to what I regard as an extremely serious situation.