Cell C Team are Useless want my money but cant HELP

I have an Router account with cell c from last year round about March or April so my router went down the drain with the sim card so I asked them if I'am insured with them for the router . They told me that I'm not so I bought a new router and asked the what are the next steps for me to get my sim card ready they told me I should buy a non ricaed sim card at Shoprite,Checkers or Ackermans shop but non of the told me that I must go to a Cell Store. I tried to get a non ricaed sim card but didn't succeeded and call in again on Friday the 1st of June telling them that I can't get a non ricaed sim card on of the guys I spoke to told me it's fine if I got the ricaed sim card they will do a sim swap I went on Sunday the 3rd of June to purchase the sim card when I called them on Sunday they told me the people that are capable to help me are not available. So I called again on Monday the 4th of June seeking help from the Cell C team I spoke to Nomali and told her I want them to do a Sim swap she told me that it can't be done because the sim card is already ricaed, I explained my situation to her then I told her I want to speak to Management but only to find out that she transferred me to Sales department I told the Lady at Sales department I'm fed up with their service so I want to cancel my account. She sended me thought to the department were they deal with those things I spoke to Tsholo I the beginning she asked me questions which a person can't really remember and I explained to her that the previous people also asked me those question from Friday then she was very very rude telling me that if I don't give her the right info she won't be able to help me. So I asked her are there no other question that she can ask me so that she can help me after a while of fighting with her she eventually tells me that I must pay R900 and something so that the account can be cancelled I told her I don't have a problem but they are the people that are responsible to assist me but they all unable to help me what they only want is my MONEY. None of them were able to send me to management so know I'am sitting with a contract that is useless to me because the day they wanted me to join the were so nice to me telling me that they will always assist me but in this case they all don't want to take responsibility in resolving my issue for the past 4 days this is what I call POOR service.