bad service

i opened this contract a year ago and since then just had problems non stop. they have been deducting almost R400 of my account and have no idea for what . promises was made that ill get airtime and BIS service noW suddenly after a year i must pay them and pay my own Bis . when i phone they cant help me when i email i NEVER get a response. im experiencing really bad service and would like to cancel this contract since 6 months ago but no i have to pay almost R2000 to cancel. cant believe the lies i was told and still they keep on draining my bank account but i don't get service, RIDICULOUS