MTN signed me up for incorrect contract

On the 26th November, as part of the Black Friday special, I upgraded my MTN contract with the Samsung J7 Pro on MTN Made for Me M at R399 pm which came with a Free Grand Prime Plus on MTN Flexi R55 Top-Up. See attached documentation. The consultants activated a new number for the Flexi R55 package which was suppose to be at no monthly cost as it was part of the special. When I received a billing notification sms on Wednesday the 3rd January I discovered that the consultants had upgraded my existing contract as discussed but instead of the Flexi R55 free package, had signed me up for an additional Made for Me M contract at R399 per month. They had also removed my debit order process and placed a cash payment option in its place without my consent which meant that my debit order did not go off at the end of the month as it usually did. I immediately called the 808 helpdesk but was told to take this up with the MTN store I was dealing with in Blue Route Mall. I went to the store that morning and spoke to the manager, Zoelfaa who after speaking to the consultants I had dealt with, admitted to the mistake and promised to rectify it. She logged a ticket with the MTN head-office and promised to get back to me within a few days. She made contacted with me Friday the 5th and informed me that she had left several messages to have someone provide feedback and escalate the ticket but no one has come back to her and she would try again the following Monday. Since then I have been on the phone with MTN every few days and was given Ref: [# ********** 5] and 1- ********** 1144. Each time I call or follow up I am told to speak to another department, no one is taking responsibility to resolve the problem,3 weeks later.