Bad customer service

I have a contract with cell c missed one payment called to have them double debit me in the 28th of November 2019 when the date came they took one payment instead of 2 ...switched off my network and sent me Sms's saying I'm in arrears bear in mind I called to set up and arrangement ...so now I have to use wifi at work and home inbetween work and home I am unable to access messsges or anything on my phone I am highly disappointed and wouldn't recommend cell c to family and friends I pay so much money monthly and this is the service i get back in return the cell c customer service agents lack people s****s and training they have no idea what they are doing when I call in why did I have to call twice for the fault to be rectified if my network isn't switched on asap I'm canceling my contract and I refuse to pay whatever is still owed on this contract