Vodacom frustration

I'm so disappointed with Vodacom treated me the past few months in such the way that I'm even consider to move out of them completely. I have been a loyal customer to Vodacom and consistency paying my account fully. On the 12th September 2022 I requested a settlement quotation on my *** number which I was indeed given and quoted the amount R11 990.01 for the handset and I paid it over to Vodacom the same day, Proof of payment and the migration declaration form was signed and emailed to them. Ever since then my account is having problems and I have to call them every month, they only fix it for that month, the following month its goes back to the same problem. Now I have been billed the amount of R10 575.00 of which I don't have it on my account and this gonna affect my Credit report. Kindly assist me in this regard. I am a loyal customer and paying my account every month. I am so frustrated and annoyed by their service.