Fighting for incorrect billing and cancellation

So one of my contracts expired 24 December 2015 and I was charged this month for December higher than what my contract is. On query I was advised they bill from the 1st to the 31st of a month. If you take out a contract during the middle of a month they will pro rata you. But when your contract ends and since I was on contract from the 1st to the 24th of December which leaves 7 days outside of my contract they decide to charge me higher than my contract. <br> <br> Yet when I went to put through my cancellation they advised me that my contract only on the 28th of January 2016.<br> <br> Another reason prepaid wins hands down and another reason Telkom are *******... Still fighting to have this contract cancelled from December 2015. They don't have a telephone number for the billing department and don't confirm when they receive a cancellation form. Most frustrating company in South Africa hands down. They obviously don't declare a number so they can keep billing you