Bye bye cell c

The worst service i have ever experienced i have 3 contracts with cell c and i am cancelling all of them i have been a loyal customer for a long time with cell c but i am moving to vodacom eventhough they are more exspensive i will rather pay for better service than this. I have numerous times requested cell c to change my debit order date to 27 of each month as i have changed employers my old employer i got paid on 25 now with new employer 27 so i requested them so many times to change this i even gave up come the next month they simply debit on 25 as if i never requested them to change the date i am tired of struggling with companies and spending my hard earned money on corporations that simlpy do not have customer care now this past month again they deducted on the 25 again when i called them to enquire why it was not changed they load the debit for the first to go thru and guess what they have not deducted and today is the 10 now they have the audacity to send me an sms to say i am in arrears!! Really? How dumb can one company be? I have really had it and i was also in the process of upgrading i have called 4 times and they simply say it went thru to their credit department and guess what one of the requirements is for upgrading no arrears in past 6 months so guess what bye bye upgrade and in my case bye bye cell c