Cell C bad customer service

A very bad service with cell c I had two contracts with them which expired at the same time on fed this year, I then canceled one and upgrade the one for data which I requested I can only accept 10gig day and at least 5gig night as I am not going to use the night. I realize only 5gig day has been allocated I called and requested a recording as I'm disputing the contract it has been weeks to a month failing to resolve the matter they said they will call but nothing has been done. The other conract that I canceled on 15 March was over debited they cannot explain the breakdown as the amount doubled what I was paying on my last debit which no one was able to explain. Today I received an sms indicating R69 will be debited for an account already canceled by Feb this is rediculous. I see why Cell C is losing customers is bad customer service very poor billing system failure to resolve queries they are so bad and poor, worse ever