Bad Service and Bad Sales tactics

I took out insurance with Discovery Insure about 3 months ago. I called and got a quotation and was happy with the quotation. Last week, I received an email - that due to incorrect information provided my insurance is going to increase from 01 Jan 2023. Shocked! I call the call centre to 1) find out about the incorrect info 2) the increase. Agent tells me that my insurance will increase by about+- R800.00. Okay, please give me details of the incorrect information - she says, unfortunately Mam I don’t have the details - the system says, there is an increase. Spent over 10 Mins on the call - trying to understand this and the very rude agent told me there’s nothing she can do; there’s no one she can refer to - NOTHING. I must just be ready to pay in Jan. Asked her to put me through her manager- what was I thinking? She left me on hold - until I hung up!