Vodacom Non Existant Customer Service

I have been trying since February 2017, yes 7 months, to have a handset fee removed from my Vodacom billing, to no avail. My calls and emails just fall on def ears. Even after return calls from call centre staff and even management promising to get it done still it has not been done. I am at my wits end now with this & possibly the only way to get Vodacom to listen and sort it out would be to errect a massive billboard stating how useless Vodacom customer service is. I know the last time this was done Vodacom eventually listened. Think its also time to close all my company lines with Vodacom.