Zero rating for MTN. They are ******

I had contract with mtn on the day it expires I called them to cancel the contract cause I was starting to have financial problems and I was paying R450 for the contract. but I was advised by their consultant to take ''my mtnzero" which is free for their customers who has been long with them. And promised me that I will get 2GB data for 3 months for free while am deciding whether I continue or not. But month end they deducted more than R700 .the month after they did the same,I contacted them but could not assist me. 3rd month after deducting same amount I went to bank and reversed all the money they took. Now they blocked 🚫 the sim and taken to their lawyers.