Bad service, Incompetency & really just a battle!

I had a cellphone contract with Telkom due to the beautiful adds displayed on TV (Only good thing about Telkom are the adds). My 2 year contract was coming to an end in November Had i not gone in to cancel the contract i would have not known that if i did not cancel the contract they would just keep billing me for the data and airtime i received with my contract. And as you know 5GB of data does not come cheap!<br> So i said please cancel the contract and make me a prepaid customer until i take out a new contract. No problem BUT i need to give ONE MONTHS notice. So on the 6th of November 2015 the telkom agent at the greenacers branch writes on a inquiry form that i would like to cancel it and that it is all good, the contract will be cancelled. At the end of December i received a bill from telkom which included a big amount for my data and airtime as the contract was not cancelled... I went to the walmer park branch where the agent there tells me that the contract was not cancelled and that the correct form was not filled in. I then went back to the greenacers branch where agent says no the form she gave was correct and that the main branch did not do their job to cancel my account.