TAKING MONEY AFTER I CANCELLED THE CONTRACT

I DID CANCEL MY CONTRACT PRIOR TO THE DATE THAT THE CONTRACT IS 2 YEARS ALREADY. <br> <br> I CANCELLED IT AT THE BEGINNING OF NOVEMBER 2015 AND AT THE 6TH OF DECEMBER MY SIM WAS CHANGED TO A PREPAID SIM.<br> <br> SO THIS MORNING THEY TOOK THE MONEY FOR THE CONTRACT AGAIN.<br> WHAT IS MAKING ME VERY FURIOUS IS THAT THE CELLC CUSTOMER CARE CANNOT EVEN SEE WHY THEY DEDUCTED THE MONEY BECAUSE ON THE SYSTEM MY SIM IS NOT A CONTRACT ANYMORE!!!!<br> <br> THIS IS PATHETIC!! CELLC MAKES PROMISES AND THIS IS A CASE OF *****!!<br>