Vodacom cannot get my debits correct

I have been experiencing an issue with my billing from February 2017. I dealt with the contact centre for months and got no answers. I wrote a review on Hello Peter and my issue was resolved in a month, only to have the exact same issue occur from the month after to current. I am getting double debited from September 2017 to current. I called the contact centre and the agent i spoke to put me on hold and then cut the call. I have received very poor customer service from Vodacom and i have been dealing with them for over 11 years.