MTN losing loyal customers due to non-existent dispute service

I have been a loyal customer to MTN for over 20 years. Never had an unpaid debit order or any dispute until MTN ended the data contract I agreed upon and the "system" automatically converted my contract to a 3x higher rate option without any consent from me. I've been battling to get anyone from assisting to resolve this issue for the past 3 months. It took MTN 1 month to figure out what the "system" did and after complaining to the store, branch & area manager, emailing & phoning MTN constantly.... still NOTHING!! MTN, quick to take your money and secure contracts for loyal customers.... but dead, not even slow at getting disputes resolved!!