the WORSE service ever

Ive trying to cancel my Get it Benefit on my contract, i 1st went to a branch in Trade route mall and they reversed it, but after a month they double deducted my account when i went to the Centurion Mall that's when they told me that i need to call the call centre to cancel it, i called the call centre 9 September and i spoke to Mellisa and she said that it has a turn around time of 30 days and someone will call me back to confirm the cancellation the deduction went off on the 27th , I'm still waiting for the call. i called again around 13 October 2015, 20 October, and they said they are escalating the matter and Jerome is supposed to call me back.... they just have the worse customer service ever!!! never doing business with them again