Stupid Cell

I called Cell C for about 5 times and spoke to stupid consultant who dont know what is customer service, they all hanged the phone on my ear. My query is that Cell C has apparently permanently deleted my number and all the consultant claim i failed authentication after 5 attempts one consultant managed to say i have passed authentication. Cell c cancelled one of my other contract and claims i owe them they cant provide me with invoices of which months i owe. And the other number was a month to month contract which i cancelled and was never cancelled i was paying R35 for that number after about 3 months the number was owing R576