Absolutely Appalling experience

If I could give no stars, that would be more appropriate. The service or in my case, complete lack thereof, is appalling and their willingness to just keep debitting customers accounts after cancellations are extremely concerning. I had cancelled my cell phone contract in early December. I still debited after cancelation on 31 December. They claim that this was for the month of December. I had already paid for December as I pay in advance for the month! How else would I have service for that month? When I enquired about my account, after several tries, they finally deigned to answer that as they had already invoiced me, this is why I was charged, even though I had no service for the month January. I was then invoiced for R200 late fees when they had already debited my account! Attempts to reach anyone to sort this out is like trying to squeeze water from a rock! I refuse to pay R200 for nothing. Why is it that taking a cell phone contract is like signing your life away?!