Poor service

I'm disappointed by cell c I have a cellphone contract for Samsung a30 I've been paying my contract using a debit order I requesting for a debit date change since last year to find out that the debit date was not changed I repeatedly call the customer service because I noticed that the bill has increased to find out that the debit date was not changed and the installment increased without communications not even an sms when I called the customer service they told me that the debit date was never changed when I was doing a follow up when I find out that the debit didn't go through I requested for a service request to be logged on my behalf I tried to do a follow still I'm helpless I paid the full amount with arrears because of their agents who never done their jobs and today when I went to pay I find out that the bill is still high with penalty fee they said. I called them today with one of the phone owned by one their agent at zevenwacht mall still not assisted even today I was not assisted I had to pay again another amount with penalties that I don't know what are for and the Agent and the teamleader I spoke with were not helpful in the customer service their poor service is affecting me negatively I want this to go their leaders to show them that as a customer I'm not happy at all