Even bad customer service is better than this

Honestly wish 0-stars was an option. Cancelled a LTE contract (only MTN contract) in July 2023 at a local branch where I received a reference number and the consultant confirmed no further action was required. A few months back I discovered that I was still being billed as my credit report shows I have defaulted on my MTN account and according to MTN I owe them almost R5k. Contacted their customer service as well as legal departments, but received no feedback after numerous requests. Finally visited one of their local branches again where again nobody could assist me and I was advised to contact customer care and legal, although I already have done so. Finally received feedback, but was then just passed between consultants and departments without any feedback or solution. Have been requesting feedback for days now again - with nothing. At the point of making a visit at their headoffice, where service will probably be just as bad. Avoid signing up for MTN contracts at all cost!!!