I'm so disgusted with cell c!!!!

Hi peter i have a contract with cell c for 2years now and every month my bill has been high has been a R1000 and R800 and so it goes on and i've been arressed since september month and everyday they have been foneing me and i told them to several people that im cancelling my contract as soon as I'm done and now i have to give 30 days and saying my last payment will be in january 2018 and they say i will be blacklisted if i stop my debit order i just feel its so wrong they have being robbing me since i open my contact with them and im just paying everytime feels like im paying for more than one cell phone i just want it to stop it's so wrong of them doing this every single month i must pay over R300 for a LG and its not so expensive fone....I'm so disgusted with them they are bad and i never in my life will go to them for a contract or will revear someone to go to them.....never in my life....