Bad Service receiving from Cell C Somerset Mall

I went to the Cell C store to cancel my contract as it was due for cancellation and then all of a sudden my line was cut I went back to the store asking why my line was cut then I was inform my account is in arrears then I asked them how come my account is in arrears if I cancel my contract then I was inform the cancellation wasn't process properly I went back there this part Thursday to pay an amount of four hundred and something which i still feel i don`t have to pay because i requested a cancellation and if it wasn't done then the consultant who assist me must pay for it but never the less after paying the amount they said it will take 48hrs for my line to be activated again and I am still waiting my line is still not working can you please assist or inform me what to do. thank