********** MTN deduction from my bank account - I have no MTN contract / product

if there was a choice to give no * at all. I would choose that. all day, I try to get hold of someone from MTN, so that they can delete a ********** debit order. MTN simply deducted over R 3 000 from my bank account. However I have NO account / product from MTN. Nobody seems to care within MTN. and because I do not have a MTN phone, I cannot use their customer care centre either.