Mtn sucks

I'm sick and tired of Mtn double debiting my account every 2nd month and I'm left with bank charges that I have to pay and they. My account is paid up to date every month but they still do 2nd debit order which result in an unpaid and than they sending me treats about reporting me to the bureau for not paying and cut my line. I have been calling them every month and they just give me lies all the time, they owe mean money for bank charges and refuse to pay it and switch off my line. No one is giving me proper feedback at all, I get the same lies every month. I can't wait for the contracts to end so I can cancel the poor and horrible services received from them. Worst service providers ever.