Amount due as per the dstv WhatsApp platform

I spoke to Shanwell on Saturday regarding the dispute I had with them. I was initially advised to pay R311 as per their WhatsApp platform, however they debited an amount of R927 from my account which was not successful, leading to an unpaid fee of R105. I advised that I will not be liable for that amount as it was given by them and they need to fix their mistakes, as I paid what was due as per the app. He advised that he will give me feedback by by Monday 27/05/2024, however I have still not received the call. My identity number is ***. I need this matter resolved as it is nearing my installment date