Money debited from prepaid client's bank account without consent.

I have a co-worker with no internet access to report any problems so I've been trying to assist her. Since November 2018 there's deductions from her bank account with the ref M*MTN Eazi REC ********** ********** 21. Her account went into negative balances a couple of time, where the bank also charged her penalty fees. She works for a very small salary and cannot afford this. I need to urgently know who took it into their hands to take her money from her account. This totals to about R1 050.00 in loss for her at this stage and as soon as anything gets deposited into her account this MTN reference just start biting into it again. We would really appreciate your soonest reply. I've emailed customer services as well and received this reference [# ********** 0] The affected number is ********** . Please pay her back the money.