Thieving company

After cancelling her month-to-month data contract with MTN in April 2022, they keep on debiting her account for the product. I have been trying to get a hold of someone to get this sorted out and have sent my information to the customer care, complaints department, billing department and retention department for the past month and have not gotten a single update as to the state of the issue, when they will be cancelling the debit order and when they will refund her for money they should not have taken. I am absolutely horrified that there is no way to directly speak or engage with a human being in that company.