No contract but money still debited.

<p>My contract ended on the 10th of December. My phone number was made a prepaid number on the 12th. I ported my number to Cell C on the 15th. I was fully paid up for all 24 months of my red advantage contract but billed for a new phone and data usage and contract on the 30th of December. I was told by the solutions department that even though all of the above happened my contract was not cancelled and I should phone the cancellations department so that they can action a credit. When I phoned the number it asked for my contract number before continuing to a consultant but it does not want to accept my previous contract Number!! How do I get my money Back? </p>