Vodacom insurance

I upgraded my contract in September with insurance , I was quoted an amount of 290 inclusive of vat, but to my surprise when my invoice came, the R290 is added an additional vat, I was charged twice the premium and this month as well the same story, I am beyond disappointed and find this very despicable. I have since called the insurance, spoke to their line manager Primrose who has not been of any use or help. Her consultants, Zandile,Mary Jane and Ntsoaki keep saying they will call with feedback but to this date they are still escalating with no communication. I could easily reverse this but my credit score is impacted . This is a nonsensical service and I would love this resolved asap.