PATHETIC - WON'T CANCEL DEBIT ORDERS!

I have been trying to cancel my MTN accounts for nearly a year now. I initially took out a 2-year contract, and was called the month it expired and told that it would be on a month-by-month basis. I told them I did not want it, and to cancel it. Since then, I have contacted, and been contacted by, MTN countless times, to try and cancel these contracts, and yet every month they *******ly remove money out of my account for 2 accounts I neither want nor even use. They are beyond pathetic, and I get told to call a cancellation number, or a broker, and get passed from pillar to post just to get them to stop *******ly deducting MY MONEY from me.