POOR SERVICE WITH NO FEEDBACK

I have logged a ********** claim with Vodacom in November 2017 and I have not yet received any feedback from them. I have sent numerous queries and emails since but I am still awaiting their response. I have sent all the required documents and followed all protocol but to no avail It is a nightmare getting through to them at the ***** department and nobody takes responsibility. I am still be billed for something that I did not authorise. Their is a lack of customer service at Vodacom