Extremely Terrible service

Around the 13th of August a consultant from vodacom called me to upgrade my line. After 30 minutes on a call I told him not to make any changes and leave my contract as is. He then called the account holder and upgraded the line which was done incorrectly and now the monthly payment is more then double on 2 x lines . She has been in communication for the past 2 months back and forth on calls and emails trying to cancel this upgrade on 2 numbers and revert back to the way it was and get a refund since this is not what she requested to date no one has given her the refund or rectified the contract. There is no manager to speak to when she calls and no escalation email address either. This is totally unacceptable service and needs to be resolved with a refund and contracts reverting back to what they were before the consultant made this incorrect changes!!!!!!