Sh*t mtn

*** I have been debited R329 as per agreement but this month they debit me R539 I dnt knw for what and now some of my debit orders did not get money I'm canceling this sh*t contract with mtn I'm moving to month 2 month wifi cause I took it 4 data only... Please give me a settlement amount cause I wanna cancel it cause I cannot budget for it sometimes its up and I dnt know what did I do.