Vodacom Deducts double my montly repayment for 7 months

I have been a happy Vodacom customer for years. Since Sept 2020 my premium suddenly changed from R318 to R689. I went into our local Vodacom Chatz store to Aldie (Mossel Bay). She logged a call and told me she will follow it up. Which she did. I was told that Vodacom will give me a credit for the difference. Then it started happening every month (the extra deduction, always almost double of my normal premium of R318). Aldie kept phoning and was told it is a company which just uses Vodacom as the underwriter and it was apparently for insurance..so this insurance has their own Credit department and they need to load the credit against my account. To this day (7 months later) the credit has not been loaded. It is unacceptable. I still feel Vodacom should take responsibility and I should in effect not pay ANY premium until my credit has been cancelled out. I feel unfairly treated. I am contemplating to take this matter to the Ombudsman. I have the names and reference numbers which was given to me at hand.