Disgusted with MTN

I was debited by mtn on 25 February, 5 March and then again on 31 March. I have spoken to different consultants through the 135 line and was either informed that I should reverse the debit order ( which I can't do) or that the debit order won't go off but it does still. I contacted mtn again tonight probably for the 20th time in the last 2 months and was told that I should email my bank statement to an email address which I tried to send to but says I'm blocked? Apparently the system shows that one of the payments was rejected but it definitely was not rejected on my side as mtn still took my money. I have also sent a complaint to the complaint email address and till today haven't received any feedback (2 months later)