Pathetic service from Vodacom and no response re: billing inquiry

Good day, I had initially lodged an inquiry with vodacom on 26/09/2022 re: my account billing, whereby I was overcharged by R131 for my monthly wifi subscription. I made two follow up inquiries via *** on 28/09/2022 and 04/10/2022 and I tried calling 082 135 today but the automated service advised that there was an influx of calls and I could not be assisted.

I need feedback as to why I was charged R131 more than every other month without any prior notification. There was no courtesy of a response to any of my inquiries or complaints and I have now reached my wits end with trying to contact "customer care"