Poor billing and ********** service

Less than two months ago, I called into Cell C requesting a settlement amount for a mobile contract. I called on different occasions requesting the amount and I was told that I needed to pay 2k to settle the debt. When I called in to request the settlement letter, a consultant informed that I still had an outstanding amount if R450. I was in disagreement because I was very clear that I wanted to settle the amount and 2k is what I was given End of August, debit order didn't go off, I presume because my 1st complaint was taken seriously, however, last night, R450 was debited from my account I don't recommend CELL C. The professionalism when it comes to billing is absolutely **********, I am saying this because I am in debt for a wifi router, which I've used for a month and suddenly in debt of 23k which I have no clue about.